diff --git a/app/assets/stylesheets/pages/issuable.scss b/app/assets/stylesheets/pages/issuable.scss
index 4fac0cfb0baff6774a732d84120bcf5393499d8c..eeb5b5906255fd30a65fc6aed96df1dc270bf2e7 100644
--- a/app/assets/stylesheets/pages/issuable.scss
+++ b/app/assets/stylesheets/pages/issuable.scss
@@ -434,6 +434,7 @@
 .issuable-meta {
   display: inline-block;
   line-height: 18px;
+  font-size: 14px;
 }
 
 .js-issuable-selector-wrap {
diff --git a/app/assets/stylesheets/pages/merge_requests.scss b/app/assets/stylesheets/pages/merge_requests.scss
index 394980704ae08e2885eae373bbc3eb26788c705e..41b1b47713ddd6b7743030d6dcc556f8c73335e5 100644
--- a/app/assets/stylesheets/pages/merge_requests.scss
+++ b/app/assets/stylesheets/pages/merge_requests.scss
@@ -104,7 +104,7 @@
   .mr-widget-body {
     h4 {
       font-weight: 600;
-      font-size: 17px;
+      font-size: 16px;
       margin: 5px 0;
       color: $gl-gray-dark;
 
diff --git a/changelogs/unreleased/25906-title-size.yml b/changelogs/unreleased/25906-title-size.yml
new file mode 100644
index 0000000000000000000000000000000000000000..d92d06197e98e717f112dd1ad7824ce5f905540f
--- /dev/null
+++ b/changelogs/unreleased/25906-title-size.yml
@@ -0,0 +1,4 @@
+---
+title: Standardises font-size for titles in Issues, Merge Requests and Merge Request widget
+merge_request: 8235
+author: