diff --git a/toonz/sources/include/toonz/preferences.h b/toonz/sources/include/toonz/preferences.h
index 5eb760f..10c6094 100644
--- a/toonz/sources/include/toonz/preferences.h
+++ b/toonz/sources/include/toonz/preferences.h
@@ -224,6 +224,11 @@ public:
     return m_moveCurrentFrameByClickCellArea;
   }
 
+  void setInterfaceFont(std::string font);
+  QString getInterfaceFont() { return m_interfaceFont; }
+  void setInterfaceFontWeight(int weight);
+  int getInterfaceFontWeight() { return m_interfaceFontWeight; }
+
   // Visualization  tab
 
   void setShow0ThickLines(bool on);
@@ -500,7 +505,7 @@ private:
 
   QString m_units, m_cameraUnits, m_scanLevelType, m_currentRoomChoice,
       m_oldUnits, m_oldCameraUnits, m_ffmpegPath, m_shortcutPreset,
-      m_customProjectRoot;
+      m_customProjectRoot, m_interfaceFont;
   QString m_fastRenderPath;
 
   double m_defLevelWidth, m_defLevelHeight, m_defLevelDpi;
@@ -514,7 +519,7 @@ private:
       m_chunkSize, m_blanksCount, m_onionPaperThickness, m_step, m_shrink,
       m_textureSize, m_autocreationType, m_keyframeType, m_animationStep,
       m_ffmpegTimeout;  // seconds
-  int m_projectRoot, m_importPolicy;
+  int m_projectRoot, m_importPolicy, m_interfaceFontWeight;
   QString m_currentLanguage, m_currentStyleSheet;
   int m_undoMemorySize,  // in megabytes
       m_dragCellsBehaviour, m_lineTestFpsCapture, m_defLevelType, m_xsheetStep,
diff --git a/toonz/sources/toonz/main.cpp b/toonz/sources/toonz/main.cpp
index d124aae..a73a30b 100644
--- a/toonz/sources/toonz/main.cpp
+++ b/toonz/sources/toonz/main.cpp
@@ -96,14 +96,7 @@ const char *applicationRevision = "3";
 const char *dllRelativePath     = "./toonz6.app/Contents/Frameworks";
 #endif
 
-#ifdef _WIN32
-TEnv::StringVar EnvSoftwareCurrentFont("SoftwareCurrentFont", "Arial");
-#else
-TEnv::StringVar EnvSoftwareCurrentFont("SoftwareCurrentFont", "Hervetica");
-#endif
 TEnv::IntVar EnvSoftwareCurrentFontSize("SoftwareCurrentFontSize", 12);
-TEnv::StringVar EnvSoftwareCurrentFontWeight("SoftwareCurrentFontWeightIsBold",
-                                             "Yes");
 
 const char *applicationFullName = "OpenToonz 1.1.3";
 const char *rootVarName         = "TOONZROOT";
@@ -371,11 +364,12 @@ int main(int argc, char *argv[]) {
   splashPixmap.setDevicePixelRatio(QApplication::desktop()->devicePixelRatio());
 // QPixmap splashPixmap(":Resources/splash.png");
 #ifdef _WIN32
-  QFont font("Arial", -1);
+  QFont font("Segoe UI", -1);
 #else
   QFont font("Helvetica", -1);
 #endif
   font.setPixelSize(13);
+  font.setWeight(50);
   a.setFont(font);
 
   QString offsetStr("\n\n\n\n\n\n\n\n");
@@ -640,14 +634,13 @@ int main(int argc, char *argv[]) {
   }
 
   QFont *myFont;
-
-  std::string family = EnvSoftwareCurrentFont;
-  myFont             = new QFont(QString(family.c_str()));
-
+  std::string fontName =
+      Preferences::instance()->getInterfaceFont().toStdString();
+  std::string isBold =
+      Preferences::instance()->getInterfaceFontWeight() ? "Yes" : "No";
+  myFont = new QFont(QString::fromStdString(fontName));
   myFont->setPixelSize(EnvSoftwareCurrentFontSize);
-  /*-- フォントのBoldの指定 --*/
-  std::string weight = EnvSoftwareCurrentFontWeight;
-  if (strcmp(weight.c_str(), "Yes") == 0)
+  if (strcmp(isBold.c_str(), "Yes") == 0)
     myFont->setBold(true);
   else
     myFont->setBold(false);
diff --git a/toonz/sources/toonz/preferencespopup.cpp b/toonz/sources/toonz/preferencespopup.cpp
index 77e6372..eb50118 100644
--- a/toonz/sources/toonz/preferencespopup.cpp
+++ b/toonz/sources/toonz/preferencespopup.cpp
@@ -32,6 +32,7 @@
 
 // TnzCore includes
 #include "tsystem.h"
+#include "tfont.h"
 
 // Qt includes
 #include <QHBoxLayout>
@@ -339,6 +340,23 @@ void PreferencesPopup::onRoomChoiceChanged(int index) {
 
 //-----------------------------------------------------------------------------
 
+void PreferencesPopup::onInterfaceFontChanged(int index) {
+  QString font = m_interfaceFont->currentText();
+  m_pref->setInterfaceFont(font.toStdString());
+  if (font.contains("Comic Sans"))
+    DVGui::warning(tr("Life is too short for Comic Sans"));
+  if (font.contains("Wingdings"))
+    DVGui::warning(tr("Good luck.  You're on your own from here."));
+}
+
+//-----------------------------------------------------------------------------
+
+void PreferencesPopup::onInterfaceFontWeightChanged(int index) {
+  m_pref->setInterfaceFontWeight(index);
+}
+
+//-----------------------------------------------------------------------------
+
 void PreferencesPopup::onImportPolicyChanged(int index) {
   m_pref->setDefaultImportPolicy(index);
 }
@@ -1176,6 +1194,9 @@ PreferencesPopup::PreferencesPopup()
       new QLabel(tr("* Changes will take effect the next time you run Toonz"));
   note_interface->setStyleSheet("font-size: 10px; font: italic;");
 
+  m_interfaceFont       = new QComboBox(this);
+  m_interfaceFontWeight = new QComboBox(this);
+
   //--- Visualization ------------------------------
   categoryList->addItem(tr("Visualization"));
   CheckBox *show0ThickLinesCB =
@@ -1419,6 +1440,33 @@ PreferencesPopup::PreferencesPopup()
   viewerZoomCenterComboBox->addItems(zoomCenters);
   viewerZoomCenterComboBox->setCurrentIndex(m_pref->getViewerZoomCenter());
 
+  TFontManager *instance = TFontManager::instance();
+  bool validFonts;
+  try {
+    instance->loadFontNames();
+    validFonts = true;
+  } catch (TFontLibraryLoadingError &) {
+    validFonts = false;
+    //    TMessage::error(toString(e.getMessage()));
+  }
+
+  if (validFonts) {
+    std::vector<std::wstring> names;
+    instance->getAllFamilies(names);
+
+    for (std::vector<std::wstring>::iterator it = names.begin();
+         it != names.end(); ++it)
+      m_interfaceFont->addItem(QString::fromStdWString(*it));
+
+    m_interfaceFont->setCurrentText(m_pref->getInterfaceFont());
+  }
+
+  QStringList fontStyles;
+  fontStyles << "Regular"
+             << "Bold";
+  m_interfaceFontWeight->addItems(fontStyles);
+  m_interfaceFontWeight->setCurrentIndex(m_pref->getInterfaceFontWeight());
+
   //--- Visualization ------------------------------
   show0ThickLinesCB->setChecked(m_pref->getShow0ThickLines());
   regionAntialiasCB->setChecked(m_pref->getRegionAntialias());
@@ -1774,6 +1822,14 @@ PreferencesPopup::PreferencesPopup()
                                  Qt::AlignRight | Qt::AlignVCenter);
           bgColorsLay->addWidget(languageType, 7, 1, 1, 4);
         }
+        if (m_interfaceFont->count() > 0) {
+          bgColorsLay->addWidget(new QLabel(tr("Font *:")), 8, 0,
+                                 Qt::AlignRight | Qt::AlignVCenter);
+          bgColorsLay->addWidget(m_interfaceFont, 8, 1, 1, 4);
+          bgColorsLay->addWidget(new QLabel(tr("Font Weight *:")), 9, 0,
+                                 Qt::AlignRight | Qt::AlignVCenter);
+          bgColorsLay->addWidget(m_interfaceFontWeight, 9, 1, 1, 4);
+        }
       }
       bgColorsLay->setColumnStretch(0, 0);
       bgColorsLay->setColumnStretch(1, 0);
@@ -2246,6 +2302,10 @@ PreferencesPopup::PreferencesPopup()
   ret =
       ret && connect(viewerZoomCenterComboBox, SIGNAL(currentIndexChanged(int)),
                      this, SLOT(onViewerZoomCenterChanged(int)));
+  ret = ret && connect(m_interfaceFont, SIGNAL(currentIndexChanged(int)), this,
+                       SLOT(onInterfaceFontChanged(int)));
+  ret = ret && connect(m_interfaceFontWeight, SIGNAL(currentIndexChanged(int)),
+                       this, SLOT(onInterfaceFontWeightChanged(int)));
   ret = ret && connect(replaceAfterSaveLevelAsCB, SIGNAL(stateChanged(int)),
                        this, SLOT(onReplaceAfterSaveLevelAsChanged(int)));
   ret =
diff --git a/toonz/sources/toonz/preferencespopup.h b/toonz/sources/toonz/preferencespopup.h
index c67ace3..7da18cc 100644
--- a/toonz/sources/toonz/preferencespopup.h
+++ b/toonz/sources/toonz/preferencespopup.h
@@ -54,7 +54,7 @@ private:
   QComboBox *m_keyframeType, *m_cellsDragBehaviour, *m_defScanLevelType,
       *m_defLevelType, *m_autocreationType, *m_levelFormatNames,
       *m_columnIconOm, *m_unitOm, *m_cameraUnitOm, *m_importPolicy,
-      *m_vectorSnappingTargetCB;
+      *m_interfaceFont, *m_interfaceFontWeight, *m_vectorSnappingTargetCB;
 
   DVGui::MeasuredDoubleLineEdit *m_defLevelWidth, *m_defLevelHeight;
 
@@ -184,6 +184,8 @@ private slots:
   void onInputCellsWithoutDoubleClickingClicked(int);
   void onShortcutCommandsWhileRenamingCellClicked(int);
   void onWatchFileSystemClicked(int);
+  void onInterfaceFontChanged(int index);
+  void onInterfaceFontWeightChanged(int index);
 };
 
 //**********************************************************************************
diff --git a/toonz/sources/toonz/xshcellviewer.cpp b/toonz/sources/toonz/xshcellviewer.cpp
index 8933f59..7545db3 100644
--- a/toonz/sources/toonz/xshcellviewer.cpp
+++ b/toonz/sources/toonz/xshcellviewer.cpp
@@ -514,11 +514,15 @@ void RenameCellField::showInRowCol(int row, int col, bool multiColumnSelected) {
   m_row = row;
   m_col = col;
 
+  QString fontName = Preferences::instance()->getInterfaceFont();
+  if (fontName == "") {
 #ifdef _WIN32
-  static QFont font("Arial", -1, QFont::Normal);
+    fontName = "Arial";
 #else
-  static QFont font("Helvetica", -1, QFont::Normal);
+    fontName = "Helvetica";
 #endif
+  }
+  static QFont font(fontName, -1, QFont::Normal);
   font.setPixelSize(XSHEET_FONT_PX_SIZE);
   setFont(font);
   setAlignment(Qt::AlignRight | Qt::AlignBottom);
@@ -633,7 +637,7 @@ void RenameCellField::renameCell() {
         fid = TFrameId(fidRe.cap(1).toInt(),
                        fidRe.cap(2) == "" ? 0 : fidRe.cap(2).toLatin1()[0]);
 #else
-        fid = TFrameId(fidRe.cap(1).toInt(),
+        fid  = TFrameId(fidRe.cap(1).toInt(),
                        fidRe.cap(2) == "" ? 0 : fidRe.cap(2).toAscii()[0]);
 #endif
         FilmstripCmd::renumberDrawing(sl, cell.m_frameId, fid);
@@ -1415,11 +1419,15 @@ void CellArea::drawLevelCell(QPainter &p, int row, int col, bool isReference) {
   p.setPen(isRed ? m_viewer->getSelectedColumnTextColor()
                  : m_viewer->getTextColor());
 
+  QString fontName = Preferences::instance()->getInterfaceFont();
+  if (fontName == "") {
 #ifdef _WIN32
-  static QFont font("Arial", -1, QFont::Normal);
+    fontName = "Arial";
 #else
-  static QFont font("Helvetica", -1, QFont::Normal);
+    fontName          = "Helvetica";
 #endif
+  }
+  static QFont font(fontName, -1, QFont::Normal);
   font.setPixelSize(XSHEET_FONT_PX_SIZE);
   p.setFont(font);
 
@@ -1549,13 +1557,17 @@ void CellArea::drawSoundTextCell(QPainter &p, int row, int col) {
   p.setPen(Qt::black);
   QRect nameRect = o->rect(PredefinedRect::CELL_NAME).translated(QPoint(x, y));
 
-// il nome va scritto se e' diverso dalla cella precedente oppure se
-// siamo su una marker line
+  // il nome va scritto se e' diverso dalla cella precedente oppure se
+  // siamo su una marker line
+  QString fontName = Preferences::instance()->getInterfaceFont();
+  if (fontName == "") {
 #ifdef _WIN32
-  static QFont font("Arial", -1, QFont::Normal);
+    fontName = "Arial";
 #else
-  static QFont font("Helvetica", -1, QFont::Normal);
+    fontName          = "Helvetica";
 #endif
+  }
+  static QFont font(fontName, -1, QFont::Normal);
   font.setPixelSize(XSHEET_FONT_PX_SIZE);
   p.setFont(font);
 
@@ -1578,7 +1590,7 @@ void CellArea::drawSoundTextCell(QPainter &p, int row, int col) {
   QFontMetrics metric(font);
   QString elidaName = elideText(text, metric, nameRect.width(), "~");
 #else
-  QString elidaName = elideText(text, font, nameRect.width(), "~");
+  QString elidaName   = elideText(text, font, nameRect.width(), "~");
 #endif
 
   if (!sameLevel || prevCell.m_frameId != cell.m_frameId)
@@ -1686,13 +1698,17 @@ void CellArea::drawPaletteCell(QPainter &p, int row, int col,
     if (pl && !pl->getPalette()) isRed = true;
     p.setPen(isRed ? m_viewer->getSelectedColumnTextColor()
                    : m_viewer->getTextColor());
-// il nome va scritto se e' diverso dalla cella precedente oppure se
-// siamo su una marker line
+    // il nome va scritto se e' diverso dalla cella precedente oppure se
+    // siamo su una marker line
+    QString fontName = Preferences::instance()->getInterfaceFont();
+    if (fontName == "") {
 #ifdef _WIN32
-    static QFont font("Arial", -1, QFont::Normal);
+      fontName = "Arial";
 #else
-    static QFont font("Helvetica", -1, QFont::Normal);
+      fontName        = "Helvetica";
 #endif
+    }
+    static QFont font(fontName, -1, QFont::Normal);
     font.setPixelSize(XSHEET_FONT_PX_SIZE);
     p.setFont(font);
     QFontMetrics fm(font);
diff --git a/toonz/sources/toonz/xshcolumnviewer.cpp b/toonz/sources/toonz/xshcolumnviewer.cpp
index b48c669..9a01fe0 100644
--- a/toonz/sources/toonz/xshcolumnviewer.cpp
+++ b/toonz/sources/toonz/xshcolumnviewer.cpp
@@ -339,11 +339,15 @@ void ChangeObjectParent::refresh() {
   for (i = 0; i < columnList.size(); i++) addItem(columnList.at(i));
   for (i = 0; i < pegbarList.size(); i++) addItem(pegbarList.at(i));
 
+  QString fontName = Preferences::instance()->getInterfaceFont();
+  if (fontName == "") {
 #ifdef _WIN32
-  static QFont font("Arial", -1, QFont::Bold);
+    fontName = "Arial";
 #else
-  static QFont font("Helvetica", -1, QFont::Normal);
+    fontName = "Helvetica";
 #endif
+  }
+  static QFont font(fontName, -1, QFont::Normal);
   // set font size in pixel
   font.setPixelSize(XSHEET_FONT_PX_SIZE);
 
@@ -460,11 +464,15 @@ RenameColumnField::RenameColumnField(QWidget *parent, XsheetViewer *viewer)
 void RenameColumnField::show(const QRect &rect, int col) {
   move(rect.topLeft());
   setFixedSize(rect.size());
+  QString fontName = Preferences::instance()->getInterfaceFont();
+  if (fontName == "") {
 #ifdef _WIN32
-  static QFont font("Arial", -1, QFont::Normal);
+    fontName = "Arial";
 #else
-  static QFont font("Helvetica", -1, QFont::Normal);
+    fontName = "Helvetica";
 #endif
+  }
+  static QFont font(fontName, -1, QFont::Normal);
   font.setPixelSize(XSHEET_FONT_PX_SIZE);
   setFont(font);
   m_col = col;
@@ -550,12 +558,16 @@ ColumnArea::DrawHeader::DrawHeader(ColumnArea *nArea, QPainter &nP, int nCol)
 }
 
 void ColumnArea::DrawHeader::prepare() const {
-// Preparing painter
+  // Preparing painter
+  QString fontName = Preferences::instance()->getInterfaceFont();
+  if (fontName == "") {
 #ifdef _WIN32
-  QFont font("Arial", -1, QFont::Normal);
+    fontName = "Arial";
 #else
-  QFont font("Helvetica", -1, QFont::Normal);
+    fontName = "Helvetica";
 #endif
+  }
+  static QFont font(fontName, -1, QFont::Normal);
   font.setPixelSize(XSHEET_FONT_PX_SIZE);
 
   p.setFont(font);
@@ -1112,12 +1124,16 @@ void ColumnArea::drawLevelColumnHead(QPainter &p, int col) {
   TColumnSelection *selection = m_viewer->getColumnSelection();
   const Orientation *o        = m_viewer->orientation();
 
-// Preparing painter
+  // Preparing painter
+  QString fontName = Preferences::instance()->getInterfaceFont();
+  if (fontName == "") {
 #ifdef _WIN32
-  static QFont font("Arial", -1, QFont::Normal);
+    fontName = "Arial";
 #else
-  static QFont font("Helvetica", -1, QFont::Normal);
+    fontName       = "Helvetica";
 #endif
+  }
+  static QFont font(fontName, -1, QFont::Normal);
   font.setPixelSize(XSHEET_FONT_PX_SIZE);
 
   p.setFont(font);
@@ -1182,11 +1198,15 @@ void ColumnArea::drawSoundColumnHead(QPainter &p, int col) {  // AREA
   int x = m_viewer->columnToLayerAxis(col);
 
   p.setRenderHint(QPainter::SmoothPixmapTransform, true);
+  QString fontName = Preferences::instance()->getInterfaceFont();
+  if (fontName == "") {
 #ifdef _WIN32
-  static QFont font("Arial", -1, QFont::Normal);
+    fontName = "Arial";
 #else
-  static QFont font("Helvetica", -1, QFont::Normal);
+    fontName       = "Helvetica";
 #endif
+  }
+  static QFont font(fontName, -1, QFont::Normal);
   font.setPixelSize(XSHEET_FONT_PX_SIZE);
   p.setFont(font);
 
@@ -1230,11 +1250,15 @@ void ColumnArea::drawPaletteColumnHead(QPainter &p, int col) {  // AREA
 
   QPoint orig = m_viewer->positionToXY(CellPosition(0, max(col, 0)));
 
+  QString fontName = Preferences::instance()->getInterfaceFont();
+  if (fontName == "") {
 #ifdef _WIN32
-  static QFont font("Arial", -1, QFont::Normal);
+    fontName = "Arial";
 #else
-  static QFont font("Helvetica", -1, QFont::Normal);
+    fontName       = "Helvetica";
 #endif
+  }
+  static QFont font(fontName, -1, QFont::Normal);
   font.setPixelSize(XSHEET_FONT_PX_SIZE);
 
   p.setFont(font);
@@ -1277,11 +1301,15 @@ void ColumnArea::drawSoundTextColumnHead(QPainter &p, int col) {  // AREA
   int x = m_viewer->columnToLayerAxis(col);
 
   p.setRenderHint(QPainter::SmoothPixmapTransform, true);
+  QString fontName = Preferences::instance()->getInterfaceFont();
+  if (fontName == "") {
 #ifdef _WIN32
-  static QFont font("Arial", -1, QFont::Normal);
+    fontName = "Arial";
 #else
-  static QFont font("Helvetica", -1, QFont::Normal);
+    fontName       = "Helvetica";
 #endif
+  }
+  static QFont font(fontName, -1, QFont::Normal);
   font.setPixelSize(XSHEET_FONT_PX_SIZE);
   p.setFont(font);
 
diff --git a/toonz/sources/toonz/xshrowviewer.cpp b/toonz/sources/toonz/xshrowviewer.cpp
index ebf6917..4bf724b 100644
--- a/toonz/sources/toonz/xshrowviewer.cpp
+++ b/toonz/sources/toonz/xshrowviewer.cpp
@@ -87,11 +87,15 @@ void RowArea::drawRows(QPainter &p, int r0, int r1) {
     playR0       = 0;
   }
 
+  QString fontName = Preferences::instance()->getInterfaceFont();
+  if (fontName == "") {
 #ifdef _WIN32
-  static QFont font("Arial", -1, QFont::Bold);
+    fontName = "Arial";
 #else
-  static QFont font("Helvetica", -1, QFont::Normal);
+    fontName = "Helvetica";
 #endif
+  }
+  static QFont font(fontName, -1, QFont::Bold);
   // set font size in pixel
   font.setPixelSize(XSHEET_FONT_PX_SIZE);
 
diff --git a/toonz/sources/toonzlib/preferences.cpp b/toonz/sources/toonzlib/preferences.cpp
index 6de661e..9256842 100644
--- a/toonz/sources/toonzlib/preferences.cpp
+++ b/toonz/sources/toonzlib/preferences.cpp
@@ -224,6 +224,12 @@ Preferences::Preferences()
     , m_cameraUnits("inch")
     , m_currentRoomChoice("Default")
     , m_scanLevelType("tif")
+#ifdef _WIN32
+    , m_interfaceFont("Segoe UI")
+#else
+    , m_interfaceFont("Helvetica")
+#endif
+    , m_interfaceFontWeight(0)
     , m_defLevelWidth(0.0)
     , m_defLevelHeight(0.0)
     , m_defLevelDpi(0.0)
@@ -600,6 +606,10 @@ Preferences::Preferences()
   QString shortcutPreset = m_settings->value("shortcutPreset").toString();
   if (shortcutPreset != "") m_shortcutPreset = shortcutPreset;
   setShortcutPreset(m_shortcutPreset.toStdString());
+  QString interfaceFont = m_settings->value("interfaceFont").toString();
+  if (interfaceFont != "") m_interfaceFont = interfaceFont;
+  setInterfaceFont(m_interfaceFont.toStdString());
+  getValue(*m_settings, "interfaceFontWeight", m_interfaceFontWeight);
   getValue(*m_settings, "useNumpadForSwitchingStyles",
            m_useNumpadForSwitchingStyles);
   getValue(*m_settings, "newLevelSizeToCameraSizeEnabled",
@@ -1209,6 +1219,20 @@ QString Preferences::getCurrentStyleSheetName() const {
 
 //-----------------------------------------------------------------
 
+void Preferences::setInterfaceFont(std::string font) {
+  m_interfaceFont = QString::fromStdString(font);
+  m_settings->setValue("interfaceFont", m_interfaceFont);
+}
+
+//-----------------------------------------------------------------
+
+void Preferences::setInterfaceFontWeight(int weight) {
+  m_interfaceFontWeight = weight;
+  m_settings->setValue("interfaceFontWeight", m_interfaceFontWeight);
+}
+
+//-----------------------------------------------------------------
+
 QString Preferences::getCurrentStyleSheetPath() const {
   if (m_currentStyleSheet.isEmpty()) return QString();
   TFilePath path(TEnv::getConfigDir() + "qss");
diff --git a/toonz/sources/toonzqt/functionpanel.cpp b/toonz/sources/toonzqt/functionpanel.cpp
index 13a35af..73c40f4 100644
--- a/toonz/sources/toonzqt/functionpanel.cpp
+++ b/toonz/sources/toonzqt/functionpanel.cpp
@@ -13,7 +13,7 @@
 #include "toonz/tframehandle.h"
 #include "toonz/doubleparamcmd.h"
 #include "toonz/toonzfolders.h"
-
+#include "toonz/preferences.h"
 // TnzBase includes
 #include "tdoubleparam.h"
 #include "tdoublekeyframe.h"
@@ -1067,8 +1067,17 @@ void FunctionPanel::drawGroupKeyframes(QPainter &painter) {
 void FunctionPanel::paintEvent(QPaintEvent *e) {
   m_gadgets.clear();
 
+  QString fontName = Preferences::instance()->getInterfaceFont();
+  if (fontName == "") {
+#ifdef _WIN32
+    fontName = "Arial";
+#else
+    fontName = "Helvetica";
+#endif
+  }
+
   QPainter painter(this);
-  QFont font("Arial", 8);
+  QFont font(fontName, 8);
   painter.setFont(font);
   QFontMetrics fm(font);
 
diff --git a/toonz/sources/toonzqt/functionsheet.cpp b/toonz/sources/toonzqt/functionsheet.cpp
index 2f304dd..0963ff2 100644
--- a/toonz/sources/toonzqt/functionsheet.cpp
+++ b/toonz/sources/toonzqt/functionsheet.cpp
@@ -642,11 +642,15 @@ void FunctionSheetCellViewer::drawCells(QPainter &painter, int r0, int c0,
           text.append("~");
         }
 
+        QString fontName = Preferences::instance()->getInterfaceFont();
+        if (fontName == "") {
 #ifdef _WIN32
-        static QFont font("Arial", -1, QFont::Bold);
+          fontName = "Arial";
 #else
-        static QFont font("Helvetica", -1, QFont::Bold);
+          fontName = "Helvetica";
 #endif
+        }
+        static QFont font(fontName, -1, QFont::Bold);
         font.setPixelSize(12);
         painter.setFont(font);
         painter.drawText(cellRect.adjusted(10, 0, 0, 0),
@@ -693,11 +697,15 @@ void FunctionSheetCellViewer::mouseDoubleClickEvent(QMouseEvent *e) {
   } else
     m_lineEdit->setText("");
 
+  QString fontName = Preferences::instance()->getInterfaceFont();
+  if (fontName == "") {
 #ifdef _WIN32
-  static QFont font("Arial", 9, QFont::Normal);
+    fontName = "Arial";
 #else
-  static QFont font("Helvetica", 9, QFont::Normal);
+    fontName = "Helvetica";
 #endif
+  }
+  static QFont font(fontName, 9, QFont::Normal);
   m_lineEdit->setFont(font);
 
   m_lineEdit->setGeometry(x0 - 2, y0 - 2, x1 - x0 + 1 + 4,
diff --git a/toonz/sources/toonzqt/spreadsheetviewer.cpp b/toonz/sources/toonzqt/spreadsheetviewer.cpp
index aae6779..9a7e7a8 100644
--- a/toonz/sources/toonzqt/spreadsheetviewer.cpp
+++ b/toonz/sources/toonzqt/spreadsheetviewer.cpp
@@ -2,6 +2,7 @@
 
 #include "toonzqt/spreadsheetviewer.h"
 #include "toonzqt/gutil.h"
+#include "toonz/preferences.h"
 
 #include "toonz/tframehandle.h"
 #include "orientation.h"
@@ -291,11 +292,15 @@ DragTool *RowPanel::createDragTool(QMouseEvent *) {
 //-----------------------------------------------------------------------------
 
 void RowPanel::drawRows(QPainter &p, int r0, int r1) {
+  QString fontName = Preferences::instance()->getInterfaceFont();
+  if (fontName == "") {
 #ifdef _WIN32
-  static QFont font("Arial", -1, QFont::Bold);
+    fontName = "Arial";
 #else
-  static QFont font("Helvetica", -1, QFont::Bold);
+    fontName = "Helvetica";
 #endif
+  }
+  static QFont font(fontName, -1, QFont::Bold);
   font.setPixelSize(12);
   p.setFont(font);