diff --git a/.upgradenotes/MDL-81961-2026020605441060.yml b/.upgradenotes/MDL-81961-2026020605441060.yml
new file mode 100644
index 00000000000..2cb96e51926
--- /dev/null
+++ b/.upgradenotes/MDL-81961-2026020605441060.yml
@@ -0,0 +1,12 @@
+issueNumber: MDL-81961
+notes:
+  core_question:
+    - message: |
+        core_question:
+            - message: |
+                Final deprecation of `moodle-question-chooser` YUI module.
+              type: removed
+            - message: |
+                Final deprecation of `core_question/qbank_chooser` template.
+              type: removed
+      type: removed
diff --git a/public/question/templates/qbank_chooser.mustache b/public/question/templates/qbank_chooser.mustache
deleted file mode 100644
index 2343d89b0fe..00000000000
--- a/public/question/templates/qbank_chooser.mustache
+++ /dev/null
@@ -1,29 +0,0 @@
-{{!
-    This file is part of Moodle - http://moodle.org/
-
-    Moodle is free software: you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 3 of the License, or
-    (at your option) any later version.
-
-    Moodle is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
-}}
-{{!
-    Question bank chooser.
-}}
-{{> core/chooser }}
-{{#js}}
-require([
-    'core/yui'
-], function(Y) {
-    Y.use('moodle-question-chooser', function() {
-        M.question.init_chooser();
-    });
-});
-{{/js}}
diff --git a/public/question/yui/build/moodle-question-chooser/moodle-question-chooser-debug.js b/public/question/yui/build/moodle-question-chooser/moodle-question-chooser-debug.js
deleted file mode 100644
index 8ae50df8904..00000000000
--- a/public/question/yui/build/moodle-question-chooser/moodle-question-chooser-debug.js
+++ /dev/null
@@ -1,81 +0,0 @@
-YUI.add('moodle-question-chooser', function (Y, NAME) {
-
-// This file is part of Moodle - http://moodle.org/
-//
-// Moodle is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// Moodle is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
-
-/**
- * JavaScript required by the question type chooser pop-up.
- *
- * @module moodle-question-chooser
- */
-
-Y.log("The moodle-question-chooser module has been deprecated. " +
-    "Please use moodle-qbank_editquestion-chooser instead.", 'moodle-core-notification', 'warn');
-
-var SELECTORS = {
-    CREATENEWQUESTION: 'div.createnewquestion',
-    CREATENEWQUESTIONFORM: 'div.createnewquestion form',
-    CHOOSERDIALOGUE: 'div.chooserdialoguebody',
-    CHOOSERHEADER: 'div.choosertitle'
-};
-
-function Chooser() {
-    Chooser.superclass.constructor.apply(this, arguments);
-}
-
-Y.extend(Chooser, M.core.chooserdialogue, {
-    initializer: function() {
-        Y.all('form').each(function(node) {
-            if (/question\/addquestion\.php/.test(node.getAttribute('action'))) {
-                node.on('submit', this.displayQuestionChooser, this);
-            }
-        }, this);
-    },
-    displayQuestionChooser: function(e) {
-        var dialogue = Y.one(SELECTORS.CREATENEWQUESTION + ' ' + SELECTORS.CHOOSERDIALOGUE),
-            header = Y.one(SELECTORS.CREATENEWQUESTION + ' ' + SELECTORS.CHOOSERHEADER);
-
-        if (this.container === null) {
-            // Setup the dialogue, and then prepare the chooser if it's not already been set up.
-            this.setup_chooser_dialogue(dialogue, header, {});
-            this.prepare_chooser();
-        }
-
-        // Update all of the hidden fields within the questionbank form.
-        var originForm = e.target.ancestor('form', true),
-            targetForm = this.container.one('form'),
-            hiddenElements = originForm.all('input[type="hidden"]');
-
-        targetForm.all('input.customfield').remove();
-        hiddenElements.each(function(field) {
-            targetForm.appendChild(field.cloneNode())
-                .removeAttribute('id')
-                .addClass('customfield');
-        });
-
-        // Display the chooser dialogue.
-        this.display_chooser(e);
-    }
-}, {
-    NAME: 'questionChooser'
-});
-
-M.question = M.question || {};
-M.question.init_chooser = function(config) {
-    return new Chooser(config);
-};
-
-
-}, '@VERSION@', {"requires": ["moodle-core-chooserdialogue"]});
diff --git a/public/question/yui/build/moodle-question-chooser/moodle-question-chooser-min.js b/public/question/yui/build/moodle-question-chooser/moodle-question-chooser-min.js
deleted file mode 100644
index 869c2716281..00000000000
--- a/public/question/yui/build/moodle-question-chooser/moodle-question-chooser-min.js
+++ /dev/null
@@ -1 +0,0 @@
-YUI.add("moodle-question-chooser",function(n,o){var s="div.createnewquestion",r="div.chooserdialoguebody",u="div.choosertitle";function e(){e.superclass.constructor.apply(this,arguments)}n.extend(e,M.core.chooserdialogue,{initializer:function(){n.all("form").each(function(o){/question\/addquestion\.php/.test(o.getAttribute("action"))&&o.on("submit",this.displayQuestionChooser,this)},this)},displayQuestionChooser:function(o){var e,i=n.one(s+" "+r),t=n.one(s+" "+u);null===this.container&&(this.setup_chooser_dialogue(i,t,{}),this.prepare_chooser()),i=o.target.ancestor("form",!0),e=this.container.one("form"),t=i.all('input[type="hidden"]'),e.all("input.customfield").remove(),t.each(function(o){e.appendChild(o.cloneNode()).removeAttribute("id").addClass("customfield")}),this.display_chooser(o)}},{NAME:"questionChooser"}),M.question=M.question||{},M.question.init_chooser=function(o){return new e(o)}},"@VERSION@",{requires:["moodle-core-chooserdialogue"]});
\ No newline at end of file
diff --git a/public/question/yui/build/moodle-question-chooser/moodle-question-chooser.js b/public/question/yui/build/moodle-question-chooser/moodle-question-chooser.js
deleted file mode 100644
index cfeecae9b4e..00000000000
--- a/public/question/yui/build/moodle-question-chooser/moodle-question-chooser.js
+++ /dev/null
@@ -1,79 +0,0 @@
-YUI.add('moodle-question-chooser', function (Y, NAME) {
-
-// This file is part of Moodle - http://moodle.org/
-//
-// Moodle is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// Moodle is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
-
-/**
- * JavaScript required by the question type chooser pop-up.
- *
- * @module moodle-question-chooser
- */
-
-
-var SELECTORS = {
-    CREATENEWQUESTION: 'div.createnewquestion',
-    CREATENEWQUESTIONFORM: 'div.createnewquestion form',
-    CHOOSERDIALOGUE: 'div.chooserdialoguebody',
-    CHOOSERHEADER: 'div.choosertitle'
-};
-
-function Chooser() {
-    Chooser.superclass.constructor.apply(this, arguments);
-}
-
-Y.extend(Chooser, M.core.chooserdialogue, {
-    initializer: function() {
-        Y.all('form').each(function(node) {
-            if (/question\/addquestion\.php/.test(node.getAttribute('action'))) {
-                node.on('submit', this.displayQuestionChooser, this);
-            }
-        }, this);
-    },
-    displayQuestionChooser: function(e) {
-        var dialogue = Y.one(SELECTORS.CREATENEWQUESTION + ' ' + SELECTORS.CHOOSERDIALOGUE),
-            header = Y.one(SELECTORS.CREATENEWQUESTION + ' ' + SELECTORS.CHOOSERHEADER);
-
-        if (this.container === null) {
-            // Setup the dialogue, and then prepare the chooser if it's not already been set up.
-            this.setup_chooser_dialogue(dialogue, header, {});
-            this.prepare_chooser();
-        }
-
-        // Update all of the hidden fields within the questionbank form.
-        var originForm = e.target.ancestor('form', true),
-            targetForm = this.container.one('form'),
-            hiddenElements = originForm.all('input[type="hidden"]');
-
-        targetForm.all('input.customfield').remove();
-        hiddenElements.each(function(field) {
-            targetForm.appendChild(field.cloneNode())
-                .removeAttribute('id')
-                .addClass('customfield');
-        });
-
-        // Display the chooser dialogue.
-        this.display_chooser(e);
-    }
-}, {
-    NAME: 'questionChooser'
-});
-
-M.question = M.question || {};
-M.question.init_chooser = function(config) {
-    return new Chooser(config);
-};
-
-
-}, '@VERSION@', {"requires": ["moodle-core-chooserdialogue"]});
diff --git a/public/question/yui/src/chooser/build.json b/public/question/yui/src/chooser/build.json
deleted file mode 100644
index cd112fe4c10..00000000000
--- a/public/question/yui/src/chooser/build.json
+++ /dev/null
@@ -1,10 +0,0 @@
-{
-    "name": "moodle-question-chooser",
-    "builds": {
-        "moodle-question-chooser": {
-            "jsfiles": [
-                "chooser.js"
-            ]
-        }
-    }
-}
diff --git a/public/question/yui/src/chooser/js/chooser.js b/public/question/yui/src/chooser/js/chooser.js
deleted file mode 100644
index e839a961ae7..00000000000
--- a/public/question/yui/src/chooser/js/chooser.js
+++ /dev/null
@@ -1,76 +0,0 @@
-// This file is part of Moodle - http://moodle.org/
-//
-// Moodle is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// Moodle is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
-
-/**
- * JavaScript required by the question type chooser pop-up.
- *
- * @module moodle-question-chooser
- */
-
-Y.log("The moodle-question-chooser module has been deprecated. " +
-    "Please use moodle-qbank_editquestion-chooser instead.", 'moodle-core-notification', 'warn');
-
-var SELECTORS = {
-    CREATENEWQUESTION: 'div.createnewquestion',
-    CREATENEWQUESTIONFORM: 'div.createnewquestion form',
-    CHOOSERDIALOGUE: 'div.chooserdialoguebody',
-    CHOOSERHEADER: 'div.choosertitle'
-};
-
-function Chooser() {
-    Chooser.superclass.constructor.apply(this, arguments);
-}
-
-Y.extend(Chooser, M.core.chooserdialogue, {
-    initializer: function() {
-        Y.all('form').each(function(node) {
-            if (/question\/addquestion\.php/.test(node.getAttribute('action'))) {
-                node.on('submit', this.displayQuestionChooser, this);
-            }
-        }, this);
-    },
-    displayQuestionChooser: function(e) {
-        var dialogue = Y.one(SELECTORS.CREATENEWQUESTION + ' ' + SELECTORS.CHOOSERDIALOGUE),
-            header = Y.one(SELECTORS.CREATENEWQUESTION + ' ' + SELECTORS.CHOOSERHEADER);
-
-        if (this.container === null) {
-            // Setup the dialogue, and then prepare the chooser if it's not already been set up.
-            this.setup_chooser_dialogue(dialogue, header, {});
-            this.prepare_chooser();
-        }
-
-        // Update all of the hidden fields within the questionbank form.
-        var originForm = e.target.ancestor('form', true),
-            targetForm = this.container.one('form'),
-            hiddenElements = originForm.all('input[type="hidden"]');
-
-        targetForm.all('input.customfield').remove();
-        hiddenElements.each(function(field) {
-            targetForm.appendChild(field.cloneNode())
-                .removeAttribute('id')
-                .addClass('customfield');
-        });
-
-        // Display the chooser dialogue.
-        this.display_chooser(e);
-    }
-}, {
-    NAME: 'questionChooser'
-});
-
-M.question = M.question || {};
-M.question.init_chooser = function(config) {
-    return new Chooser(config);
-};
diff --git a/public/question/yui/src/chooser/meta/chooser.json b/public/question/yui/src/chooser/meta/chooser.json
deleted file mode 100644
index 3bdb85e4c7b..00000000000
--- a/public/question/yui/src/chooser/meta/chooser.json
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-    "moodle-question-chooser": {
-        "requires": [
-            "moodle-core-chooserdialogue"
-        ]
-    }
-}