diff --git a/addons/mail/static/src/discuss/core/web/discuss_sidebar_categories.js b/addons/mail/static/src/discuss/core/web/discuss_sidebar_categories.js
index 3da8d371959..c2134319e56 100644
--- a/addons/mail/static/src/discuss/core/web/discuss_sidebar_categories.js
+++ b/addons/mail/static/src/discuss/core/web/discuss_sidebar_categories.js
@@ -5,6 +5,7 @@ import { ThreadIcon } from "@mail/core/common/thread_icon";
 import { discussSidebarItemsRegistry } from "@mail/core/web/discuss_sidebar";
 import { ChannelSelector } from "@mail/discuss/core/web/channel_selector";
 import { onExternalClick } from "@mail/utils/common/hooks";
+import { cleanTerm } from "@mail/utils/common/format";
 
 import { Component, useState } from "@odoo/owl";
 
@@ -84,7 +85,8 @@ export class DiscussSidebarCategories extends Component {
             const thread = this.store.Thread.records[threadLocalId];
             return (
                 (thread.is_pinned || thread.group_based_subscription) &&
-                (!this.state.quickSearchVal || thread.name.includes(this.state.quickSearchVal))
+                (!this.state.quickSearchVal ||
+                    cleanTerm(thread.name).includes(cleanTerm(this.state.quickSearchVal)))
             );
         });
     }
diff --git a/addons/mail/static/tests/discuss_app/sidebar_tests.js b/addons/mail/static/tests/discuss_app/sidebar_tests.js
index c18574a318d..66cc7146ebb 100644
--- a/addons/mail/static/tests/discuss_app/sidebar_tests.js
+++ b/addons/mail/static/tests/discuss_app/sidebar_tests.js
@@ -210,6 +210,12 @@ QUnit.test("sidebar quick search at 20 or more pinned channels", async () => {
         replace: true,
     });
     await contains(".o-mail-DiscussSidebarChannel span", { count: 0 });
+
+    // search should work in case-insensitive
+    await insertText(".o-mail-DiscussSidebar input[placeholder='Quick search...']", "C", {
+        replace: true,
+    });
+    await contains(".o-mail-DiscussSidebarChannel span", { count: 20 });
 });
 
 QUnit.test("sidebar: basic chat rendering", async () => {