diff --git a/app/assets/javascripts/discourse/app/controllers/preferences/categories.js b/app/assets/javascripts/discourse/app/controllers/preferences/categories.js
deleted file mode 100644
index 9be58acd0c0..00000000000
--- a/app/assets/javascripts/discourse/app/controllers/preferences/categories.js
+++ /dev/null
@@ -1,68 +0,0 @@
-import Controller from "@ember/controller";
-import { or } from "@ember/object/computed";
-import { popupAjaxError } from "discourse/lib/ajax-error";
-import discourseComputed from "discourse-common/utils/decorators";
-
-export default Controller.extend({
-  @discourseComputed("siteSettings.mute_all_categories_by_default")
-  saveAttrNames(muteAllCategoriesByDefault) {
-    return [
-      "watched_category_ids",
-      "tracked_category_ids",
-      "watched_first_post_category_ids",
-      muteAllCategoriesByDefault
-        ? "regular_category_ids"
-        : "muted_category_ids",
-    ];
-  },
-
-  @discourseComputed(
-    "model.watchedCategories",
-    "model.watchedFirstPostCategories",
-    "model.trackedCategories",
-    "model.mutedCategories",
-    "model.regularCategories",
-    "siteSettings.mute_all_categories_by_default"
-  )
-  selectedCategories(
-    watched,
-    watchedFirst,
-    tracked,
-    muted,
-    regular,
-    muteAllCategoriesByDefault
-  ) {
-    return []
-      .concat(
-        watched,
-        watchedFirst,
-        tracked,
-        muteAllCategoriesByDefault ? regular : muted
-      )
-      .filter(Boolean);
-  },
-
-  @discourseComputed
-  canSee() {
-    return this.get("currentUser.id") === this.get("model.id");
-  },
-
-  @discourseComputed("siteSettings.remove_muted_tags_from_latest")
-  hideMutedTags() {
-    return this.siteSettings.remove_muted_tags_from_latest !== "never";
-  },
-
-  canSave: or("canSee", "currentUser.admin"),
-
-  actions: {
-    save() {
-      this.set("saved", false);
-      return this.model
-        .save(this.saveAttrNames)
-        .then(() => {
-          this.set("saved", true);
-        })
-        .catch(popupAjaxError);
-    },
-  },
-});
diff --git a/app/assets/javascripts/discourse/app/routes/app-route-map.js b/app/assets/javascripts/discourse/app/routes/app-route-map.js
index 77dc9e1d20e..727026cade5 100644
--- a/app/assets/javascripts/discourse/app/routes/app-route-map.js
+++ b/app/assets/javascripts/discourse/app/routes/app-route-map.js
@@ -177,7 +177,6 @@ export default function () {
         this.route("emails");
         this.route("notifications");
         this.route("tracking");
-        this.route("categories");
         this.route("users");
         this.route("tags");
         this.route("interface");
diff --git a/app/assets/javascripts/discourse/app/routes/preferences-categories.js b/app/assets/javascripts/discourse/app/routes/preferences-categories.js
deleted file mode 100644
index e68405a8da5..00000000000
--- a/app/assets/javascripts/discourse/app/routes/preferences-categories.js
+++ /dev/null
@@ -1,3 +0,0 @@
-import RestrictedUserRoute from "discourse/routes/restricted-user";
-
-export default RestrictedUserRoute.extend({});
diff --git a/app/assets/javascripts/discourse/tests/acceptance/user-preferences-categories-test.js b/app/assets/javascripts/discourse/tests/acceptance/user-preferences-categories-test.js
deleted file mode 100644
index 1eeb9da6481..00000000000
--- a/app/assets/javascripts/discourse/tests/acceptance/user-preferences-categories-test.js
+++ /dev/null
@@ -1,75 +0,0 @@
-import { click, visit } from "@ember/test-helpers";
-import { test } from "qunit";
-import { acceptance } from "discourse/tests/helpers/qunit-helpers";
-import selectKit from "discourse/tests/helpers/select-kit-helper";
-
-acceptance("User Preferences - Categories", function (needs) {
-  needs.user();
-
-  let putRequestData;
-
-  needs.pretender((server, helper) => {
-    server.put("/u/eviltrout.json", (request) => {
-      putRequestData = helper.parsePostData(request.requestBody);
-      return helper.response({ user: {} });
-    });
-  });
-
-  needs.hooks.afterEach(() => {
-    putRequestData = null;
-  });
-
-  test("tracking category which is set to regular notification level for user when mute_all_categories_by_default site setting is enabled", async function (assert) {
-    this.siteSettings.mute_all_categories_by_default = true;
-
-    await visit("/u/eviltrout/preferences/categories");
-
-    const trackedCategoriesSelector = selectKit(
-      ".tracking-controls__tracked-categories .category-selector"
-    );
-
-    await trackedCategoriesSelector.expand();
-
-    assert.notOk(
-      trackedCategoriesSelector.rowByValue("4").exists(),
-      "category that is set to regular is not available for selection"
-    );
-
-    const regularCategoriesSelector = selectKit(
-      ".tracking-controls__regular-categories .category-selector"
-    );
-
-    await regularCategoriesSelector.expand();
-    await regularCategoriesSelector.deselectItemByValue("4");
-    await trackedCategoriesSelector.expand();
-    await trackedCategoriesSelector.selectRowByValue("4");
-    await click(".save-changes");
-
-    assert.deepEqual(putRequestData, {
-      "regular_category_ids[]": ["-1"],
-      "tracked_category_ids[]": ["4"],
-      "watched_category_ids[]": ["3"],
-      "watched_first_post_category_ids[]": ["-1"],
-    });
-  });
-
-  test("tracking category which is set to regular notification level for user when mute_all_categories_by_default site setting is disabled", async function (assert) {
-    await visit("/u/eviltrout/preferences/categories");
-
-    const categorySelector = selectKit(
-      ".tracking-controls__tracked-categories .category-selector"
-    );
-
-    await categorySelector.expand();
-    // User has `regular_category_ids` set to [4] in fixtures
-    await categorySelector.selectRowByValue(4);
-    await click(".save-changes");
-
-    assert.deepEqual(putRequestData, {
-      "muted_category_ids[]": ["-1"],
-      "tracked_category_ids[]": ["4"],
-      "watched_category_ids[]": ["3"],
-      "watched_first_post_category_ids[]": ["-1"],
-    });
-  });
-});
diff --git a/config/routes.rb b/config/routes.rb
index a6b7a7eb66d..63c73ce2a87 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -667,10 +667,6 @@ Discourse::Application.routes.draw do
           :constraints => {
             username: RouteFormat.username,
           }
-      get "#{root_path}/:username/preferences/categories" => "users#preferences",
-          :constraints => {
-            username: RouteFormat.username,
-          }
       get "#{root_path}/:username/preferences/users" => "users#preferences",
           :constraints => {
             username: RouteFormat.username,