diff --git a/app/assets/stylesheets/content/_user_mention.sass b/app/assets/stylesheets/content/_user_mention.sass
index 7f1b57948f..bde798630f 100644
--- a/app/assets/stylesheets/content/_user_mention.sass
+++ b/app/assets/stylesheets/content/_user_mention.sass
@@ -26,6 +26,16 @@
 // See docs/COPYRIGHT.rdoc for more details.
 //++
 
-.user-mention:before
-  content: '@'
-  color: $gray-dark
+.user-mention
+  @include varprop(color, content-link-color)
+
+  &:hover
+    text-decoration: underline
+
+  &:before
+    content: '@'
+    color: $gray-dark
+
+span.user-mention
+  // Remove text selection cursor for group
+  cursor: default
diff --git a/config/locales/en.yml b/config/locales/en.yml
index afe1cde0d3..d9193c1a37 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -1257,6 +1257,7 @@ en:
   label_group_by: "Group by"
   label_group_new: "New group"
   label_group: "Group"
+  label_group_named: "Group %{name}"
   label_group_plural: "Groups"
   label_help: "Help"
   label_here: here
@@ -1516,6 +1517,7 @@ en:
   label_used_by_types: "Used by types"
   label_used_in_projects: "Used in projects"
   label_user: "User"
+  label_user_named: "User %{name}"
   label_user_activity: "%{value}'s activity"
   label_user_anonymous: "Anonymous"
   label_user_mail_option_all: "For any event on all my projects"
diff --git a/lib/open_project/object_linking.rb b/lib/open_project/object_linking.rb
index 7d2e65f8f7..7efaa597b8 100644
--- a/lib/open_project/object_linking.rb
+++ b/lib/open_project/object_linking.rb
@@ -49,6 +49,7 @@ module OpenProject
 
         if user.active? || user.registered? || user.invited?
           href = only_path ? user_path(user) : user_url(user)
+          options[:title] ||= I18n.t(:label_user_named, name: name)
 
           link_to(name, href, options)
         else
diff --git a/lib/open_project/text_formatting/matchers/link_handlers/hash_separator.rb b/lib/open_project/text_formatting/matchers/link_handlers/hash_separator.rb
index e32932302e..27f0c35f8a 100644
--- a/lib/open_project/text_formatting/matchers/link_handlers/hash_separator.rb
+++ b/lib/open_project/text_formatting/matchers/link_handlers/hash_separator.rb
@@ -91,7 +91,10 @@ module OpenProject::TextFormatting::Matchers
 
       def render_group
         if group = Group.find_by(id: oid)
-          content_tag(:span, group.name, class: 'user-mention')
+          content_tag :span,
+                      group.name,
+                      title: I18n.t(:label_group_named, name: group.name),
+                      class: 'user-mention'
         end
       end
     end
diff --git a/spec/lib/open_project/text_formatting/markdown/markdown_formatting_spec.rb b/spec/lib/open_project/text_formatting/markdown/markdown_formatting_spec.rb
index f990209cf7..5a1e667ed2 100644
--- a/spec/lib/open_project/text_formatting/markdown/markdown_formatting_spec.rb
+++ b/spec/lib/open_project/text_formatting/markdown/markdown_formatting_spec.rb
@@ -121,7 +121,7 @@ describe OpenProject::TextFormatting::Formats::Markdown::Formatter do
       context 'with path only' do
         it 'outputs the reference' do
           assert_html_output(
-            'Link to user:"foo@bar.com"' => %(Link to <a class="user-mention" href="/users/#{user.id}">Foo Barrit</a>)
+            'Link to user:"foo@bar.com"' => %(Link to <a class="user-mention" href="/users/#{user.id}" title="User Foo Barrit">Foo Barrit</a>)
           )
         end
       end
@@ -131,7 +131,7 @@ describe OpenProject::TextFormatting::Formats::Markdown::Formatter do
           assert_html_output(
             {
               'Link to user:"foo@bar.com"' =>
-                %(Link to <a class="user-mention" href="http://openproject.org/users/#{user.id}">Foo Barrit</a>)
+                %(Link to <a class="user-mention" href="http://openproject.org/users/#{user.id}" title="User Foo Barrit">Foo Barrit</a>)
             },
             only_path: false
           )
diff --git a/spec/lib/open_project/text_formatting/markdown/markdown_spec.rb b/spec/lib/open_project/text_formatting/markdown/markdown_spec.rb
index 677ae044e3..6a8f2e6f9a 100644
--- a/spec/lib/open_project/text_formatting/markdown/markdown_spec.rb
+++ b/spec/lib/open_project/text_formatting/markdown/markdown_spec.rb
@@ -321,7 +321,7 @@ describe OpenProject::TextFormatting,
           subject { format_text("user##{linked_project_member.id}") }
 
           it {
-            is_expected.to be_html_eql("<p>#{link_to(linked_project_member.name, { controller: :users, action: :show, id: linked_project_member.id }, class: 'user-mention')}</p>")
+            is_expected.to be_html_eql("<p>#{link_to(linked_project_member.name, { controller: :users, action: :show, id: linked_project_member.id }, title: "User #{linked_project_member.name}", class: 'user-mention')}</p>")
           }
         end
 
@@ -341,7 +341,7 @@ describe OpenProject::TextFormatting,
           context 'with a common login name' do
             subject { format_text("user:\"#{linked_project_member.login}\"") }
 
-            it { is_expected.to be_html_eql("<p>#{link_to(linked_project_member.name, { controller: :users, action: :show, id: linked_project_member.id }, class: 'user-mention')}</p>") }
+            it { is_expected.to be_html_eql("<p>#{link_to(linked_project_member.name, { controller: :users, action: :show, id: linked_project_member.id }, title: "User #{linked_project_member.name}", class: 'user-mention')}</p>") }
           end
 
           context "with an email address as login name" do
@@ -353,7 +353,7 @@ describe OpenProject::TextFormatting,
             end
             subject { format_text("user:\"#{linked_project_member.login}\"") }
 
-            it { is_expected.to be_html_eql("<p>#{link_to(linked_project_member.name, { controller: :users, action: :show, id: linked_project_member.id }, class: 'user-mention')}</p>") }
+            it { is_expected.to be_html_eql("<p>#{link_to(linked_project_member.name, { controller: :users, action: :show, id: linked_project_member.id }, title: "User #{linked_project_member.name}", class: 'user-mention')}</p>") }
           end
         end
 
@@ -388,7 +388,9 @@ describe OpenProject::TextFormatting,
         subject { format_text("group##{linked_project_member_group.id}") }
 
         it 'produces the expected html' do
-          is_expected.to be_html_eql("<p><span class='user-mention'>#{linked_project_member_group.name}</span></p>")
+          is_expected.to be_html_eql(
+            "<p><span class='user-mention' title='Group #{linked_project_member_group.name}'>#{linked_project_member_group.name}</span></p>"
+            )
         end
       end