diff --git a/frontend/src/app/shared/components/header-project-select/header-project-select.component.ts b/frontend/src/app/shared/components/header-project-select/header-project-select.component.ts
index a91c8b3f444f..6e9e55feaf47 100644
--- a/frontend/src/app/shared/components/header-project-select/header-project-select.component.ts
+++ b/frontend/src/app/shared/components/header-project-select/header-project-select.component.ts
@@ -46,7 +46,6 @@ import { ApiV3Filter } from 'core-app/shared/helpers/api-v3/api-v3-filter-builde
 import { IHALCollection } from 'core-app/core/apiv3/types/hal-collection.type';
 import { ConfigurationService } from 'core-app/core/config/configuration.service';
 
-
 @Component({
   selector: 'opce-header-project-select',
   templateUrl: './header-project-select.component.html',
@@ -75,7 +74,11 @@ export class OpHeaderProjectSelectComponent extends UntilDestroyedMixin {
         .filter(
           (project) => {
             if (searchText.length) {
-              const matches = project.name.toLowerCase().includes(searchText.toLowerCase());
+              // Decompose accented letters such as é or ligatures ff or supertexts ² into basic letters
+              // and their accents, additionally remove the accents to make the search accent insensitive.
+              const normalizedProjectName = project.name.normalize('NFKD').replace(/[\u0300-\u036f]/g, '');
+              const normalizedSearchText = searchText.normalize('NFKD').replace(/[\u0300-\u036f]/g, '');
+              const matches = normalizedProjectName.toLowerCase().includes(normalizedSearchText.toLowerCase());
 
               if (!matches) {
                 return false;
diff --git a/frontend/src/app/shared/components/project-include/project-include.component.ts b/frontend/src/app/shared/components/project-include/project-include.component.ts
index 6a3b9f1d4fa3..91012c3c4299 100644
--- a/frontend/src/app/shared/components/project-include/project-include.component.ts
+++ b/frontend/src/app/shared/components/project-include/project-include.component.ts
@@ -176,8 +176,12 @@ export class OpProjectIncludeComponent extends UntilDestroyedMixin implements On
           .filter(
             (project) => {
               if (searchText.length) {
-                const matches = project.name.toLowerCase().includes(searchText.toLowerCase());
-
+                // Decompose accented letters such as é or ligatures ff or supertexts ² into basic letters
+                // and their accents, additionally remove the accents to make the search accent insensitive.
+                // Where is this being rendered? TODO: Make highlighting work
+                const normalizedProjectName = project.name.normalize('NFKD').replace(/[\u0300-\u036f]/g, '');
+                const normalizedSearchText = searchText.normalize('NFKD').replace(/[\u0300-\u036f]/g, '');
+                const matches = normalizedProjectName.toLowerCase().includes(normalizedSearchText.toLowerCase());
                 if (!matches) {
                   return false;
                 }
diff --git a/spec/features/projects/project_autocomplete_spec.rb b/spec/features/projects/project_autocomplete_spec.rb
index b43ddf283869..09d24750267f 100644
--- a/spec/features/projects/project_autocomplete_spec.rb
+++ b/spec/features/projects/project_autocomplete_spec.rb
@@ -62,12 +62,12 @@
       "Very long project name with term at the END",
       "INK14 - Foo",
       "INK15 - Bar",
-      "INK16 - Baz"
+      "INK16 - Baz",
+      "Prójéct with accents ligatures ff and supertexts ²"
     ]
 
     names.map do |name|
-      identifier = name.gsub(/[ -]+/, "-").downcase
-
+      identifier = name.gsub(/[ -]+/, "-").downcase.unicode_normalize(:nfkd).gsub(/\p{M}/, "")
       create(:project, name:, identifier:)
     end
   end
@@ -150,6 +150,15 @@
     top_menu.expect_no_result "INK14 - Foo"
     top_menu.expect_no_result "INK16 - Baz"
 
+    top_menu.search "Project with"
+    top_menu.expect_result "Prójéct with accents ligatures ff and supertexts ²"
+
+    top_menu.search "ff" # Searching for ff should return the ligature ff
+    top_menu.expect_result "Prójéct with accents ligatures ff and supertexts ²"
+
+    top_menu.search "²"
+    top_menu.expect_result "Prójéct with accents ligatures ff and supertexts ²"
+
     # Visit a project
     top_menu.search_and_select "<strong"
     top_menu.expect_current_project project2.name