diff --git a/pagure/lib/model.py b/pagure/lib/model.py
index fb3df1e..084b381 100644
--- a/pagure/lib/model.py
+++ b/pagure/lib/model.py
@@ -226,6 +226,16 @@ class User(BASE):
         return self.user
 
     @property
+    def html_title(self):
+        ''' Return the ``fullname (username)`` or simply ``username`` to be
+        used in the html templates.
+        '''
+        if self.fullname:
+            return "%s (%s)" % (self.fullname, self.user)
+        else:
+            return self.user
+
+    @property
     def groups(self):
         ''' Return the list of Group.group_name in which the user is. '''
         return [group.group_name for group in self.group_objs]
diff --git a/pagure/templates/_formhelper.html b/pagure/templates/_formhelper.html
index 145df57..ee8274d 100644
--- a/pagure/templates/_formhelper.html
+++ b/pagure/templates/_formhelper.html
@@ -106,7 +106,8 @@
 <div class="card clearfix">
   <div id="comment-{{ id }}" class="card-header">
     {{ comment.user.default_email | avatar(16) | safe }}
-    <a href="{{ url_for('view_user', username=comment.user.user)}}">
+    <a href="{{ url_for('view_user', username=comment.user.user)}}"
+        title="{{ comment.user.html_title }}">
       {{ comment.user.user }}
     </a>
     <a class="headerlink pull-xs-right" title="Permalink to this headline"
diff --git a/pagure/templates/issue.html b/pagure/templates/issue.html
index 12f15a3..e882337 100644
--- a/pagure/templates/issue.html
+++ b/pagure/templates/issue.html
@@ -34,7 +34,8 @@
   <h5 class="text-muted">
     Created <a href="#" data-toggle="tooltip" title="{{
         issue.date_created.strftime('%b %d %Y %H:%M:%S')
-      }}">{{ issue.date_created | humanize}}</a> by {{ issue.user.user }}
+      }}">{{ issue.date_created | humanize}}</a> by <span title="{{
+      issue.user.html_title }}">{{ issue.user.user }}</span>
   </h5>
   {% if issue.last_updated %}
     <h5 class="text-muted">
@@ -191,7 +192,8 @@
                     repo=repo.name,
                     username=username,
                     namespace=repo.namespace,
-                    assignee=issue.assignee.username) }}">
+                    assignee=issue.assignee.username)
+                    }}" title="{{ issue.assignee.html_title }}">
                     {{ issue.assignee.username }}
                   </a>
                 {% if authenticated and (issue.assignee.username == g.fas_user.username) %}
diff --git a/pagure/templates/pull_request.html b/pagure/templates/pull_request.html
index 6d2c04e..1ed019c 100644
--- a/pagure/templates/pull_request.html
+++ b/pagure/templates/pull_request.html
@@ -88,7 +88,7 @@
         pull_request.date_created.strftime('%b %d %Y %H:%M:%S')
       }}">{{ pull_request.date_created |humanize }}</a>
     by {{ pull_request.user.default_email | avatar(16) | safe
-      }} {{ pull_request.user.user }}
+      }} <span title="{{ pull_request.user.html_title }}">{{ pull_request.user.user }}</span>
   </h5>
   <h5 class="text-muted">
     Modified <a href="#" data-toggle="tooltip" title="{{
@@ -708,7 +708,7 @@
         {% endif %}
               <fieldset class="form-group issue-metadata-display">
                 <label><strong>Assignee</strong></label>
-                <div>
+                <div title="{{ pull_request.assignee.html_title if pull_request.assignee else '' }}">
                   {{ pull_request.assignee.username or 'Unassigned' }}
                 </div>
               </fieldset>
diff --git a/pagure/ui/filters.py b/pagure/ui/filters.py
index 95d6fac..7e3ae75 100644
--- a/pagure/ui/filters.py
+++ b/pagure/ui/filters.py
@@ -221,7 +221,7 @@ def format_loc(loc, commit=None, filename=None, tree_id=None, prequest=None,
                     '<div class="card-block">'
                     '<small><div id="comment-%(commentid)s">'
                     '<img class="avatar circle" src="%(avatar_url)s"/>'
-                    '<a href="%(url)s"> %(user)s</a> commented '
+                    '<a href="%(url)s" title="%(user_html)s"> %(user)s</a> commented '
                     '<a class="headerlink" title="Permalink '
                     'to this headline" href="#comment-%(commentid)s">'
                     '<span title="%(date)s">%(human_date)s</span>'
@@ -247,6 +247,7 @@ def format_loc(loc, commit=None, filename=None, tree_id=None, prequest=None,
                             'templ_edit': templ_edit,
                             'templ_edited': templ_edited,
                             'user': comment.user.user,
+                            'user_html': comment.user.html_title,
                             'avatar_url': avatar_url(
                                 comment.user.default_email, 16),
                             'date': comment.date_created.strftime(
diff --git a/tests/test_pagure_flask_ui_fork.py b/tests/test_pagure_flask_ui_fork.py
index f13a3b8..62d52d5 100644
--- a/tests/test_pagure_flask_ui_fork.py
+++ b/tests/test_pagure_flask_ui_fork.py
@@ -1433,6 +1433,7 @@ index 0000000..2a552bb
                 '<title>PR#2: foo bar PR - test\n - Pagure</title>',
                 output.data)
             self.assertIn('<p>Test Initial Comment</p>', output.data)
+            self.assertEqual(output.data.count('title="PY C (pingou)"'), 1)
 
             # Test if the `open changed file icon` is displayed.
             self.assertIn(
@@ -1629,6 +1630,7 @@ index 0000000..2a552bb
             self.assertIn(
                 '</button>\n                      Comment added',
                 output.data)
+            self.assertEqual(output.data.count('title="PY C (pingou)"'), 2)
 
             # Project w/o pull-request
             repo = pagure.get_authorized_project(self.session, 'test')
diff --git a/tests/test_pagure_flask_ui_issues.py b/tests/test_pagure_flask_ui_issues.py
index d88cc79..393f6e1 100644
--- a/tests/test_pagure_flask_ui_issues.py
+++ b/tests/test_pagure_flask_ui_issues.py
@@ -1181,6 +1181,7 @@ class PagureFlaskIssuestests(tests.Modeltests):
                 '<a class="btn btn-primary btn-sm" '
                 'href="/test/issue/1/edit" title="Edit this issue">',
                 output.data)
+            self.assertEqual(output.data.count('title="PY C (pingou)"'), 1)
 
             csrf_token = self.get_csrf(output=output)
 
@@ -1289,6 +1290,8 @@ class PagureFlaskIssuestests(tests.Modeltests):
             self.assertTrue(
                 '<option selected value="Fixed">Fixed</option>'
                 in output.data)
+            # 2: one for the original comment, one for the new comment
+            self.assertEqual(output.data.count('title="PY C (pingou)"'), 2)
 
             # Add new tag
             data = {
@@ -1362,7 +1365,7 @@ class PagureFlaskIssuestests(tests.Modeltests):
                 '</button>\n                      Issue assigned to pingou\n',
                 output.data)
             self.assertTrue(
-                '<a href="/test/issues?assignee=pingou">' in output.data)
+                '<a href="/test/issues?assignee=pingou" title="PY C (pingou)"' in output.data)
             self.assertTrue(
                 '<p>Woohoo a second comment !</p>' in output.data)
             self.assertEqual(output.data.count('comment_body">'), 2)