diff --git a/app/assets/javascripts/discourse/components/topic-list-item.js b/app/assets/javascripts/discourse/components/topic-list-item.js
index 7bc2d64603c..0746ed95f69 100644
--- a/app/assets/javascripts/discourse/components/topic-list-item.js
+++ b/app/assets/javascripts/discourse/components/topic-list-item.js
@@ -7,6 +7,8 @@ import { findRawTemplate } from "discourse/lib/raw-templates";
 import { wantsNewWindow } from "discourse/lib/intercept-click";
 import { on } from "@ember/object/evented";
 
+import { topicTitleDecorators } from "discourse/components/topic-title";
+
 export function showEntrance(e) {
   let target = $(e.target);
 
@@ -67,6 +69,18 @@ export default Component.extend({
         }
       });
     }
+
+    schedule("afterRender", () => {
+      if (this.element && !this.isDestroying && !this.isDestroyed) {
+        const rawTopicLink = this.element.querySelector(".raw-topic-link");
+
+        rawTopicLink &&
+          topicTitleDecorators &&
+          topicTitleDecorators.forEach(cb =>
+            cb(this.topic, rawTopicLink, "topic-list-item-title")
+          );
+      }
+    });
   },
 
   willDestroyElement() {
diff --git a/app/assets/javascripts/discourse/components/topic-title.js b/app/assets/javascripts/discourse/components/topic-title.js
index 7bbc478cb33..82d41f4ad09 100644
--- a/app/assets/javascripts/discourse/components/topic-title.js
+++ b/app/assets/javascripts/discourse/components/topic-title.js
@@ -1,6 +1,33 @@
 import Component from "@ember/component";
 import KeyEnterEscape from "discourse/mixins/key-enter-escape";
+import { schedule } from "@ember/runloop";
+
+export let topicTitleDecorators = [];
+
+export function addTopicTitleDecorator(decorator) {
+  topicTitleDecorators.push(decorator);
+}
+
+export function resetTopicTitleDecorators() {
+  topicTitleDecorators = [];
+}
 
 export default Component.extend(KeyEnterEscape, {
-  elementId: "topic-title"
+  elementId: "topic-title",
+
+  didInsertElement() {
+    this._super(...arguments);
+
+    schedule("afterRender", () => {
+      if (this.element && !this.isDestroying && !this.isDestroyed) {
+        const fancyTitle = this.element.querySelector(".fancy-title");
+
+        fancyTitle &&
+          topicTitleDecorators &&
+          topicTitleDecorators.forEach(cb =>
+            cb(this.model, fancyTitle, "topic-title")
+          );
+      }
+    });
+  }
 });
diff --git a/app/assets/javascripts/discourse/lib/plugin-api.js b/app/assets/javascripts/discourse/lib/plugin-api.js
index 9439b16319e..aaafba5b4ce 100644
--- a/app/assets/javascripts/discourse/lib/plugin-api.js
+++ b/app/assets/javascripts/discourse/lib/plugin-api.js
@@ -3,6 +3,7 @@ import deprecated from "discourse-common/lib/deprecated";
 import { iconNode } from "discourse-common/lib/icon-library";
 import { addDecorator } from "discourse/widgets/post-cooked";
 import { addPluginOutletDecorator } from "discourse/components/plugin-connector";
+import { addTopicTitleDecorator } from "discourse/components/topic-title";
 import ComposerEditor from "discourse/components/composer-editor";
 import DiscourseBanner from "discourse/components/discourse-banner";
 import { addButton } from "discourse/widgets/post-menu";
@@ -54,7 +55,7 @@ import { on } from "@ember/object/evented";
 import KeyboardShortcuts, { bindings } from "discourse/lib/keyboard-shortcuts";
 
 // If you add any methods to the API ensure you bump up this number
-const PLUGIN_API_VERSION = "0.8.39";
+const PLUGIN_API_VERSION = "0.8.40";
 
 class PluginApi {
   constructor(version, container) {
@@ -1017,6 +1018,26 @@ class PluginApi {
   decoratePluginOutlet(outletName, callback, opts) {
     addPluginOutletDecorator(outletName, callback, opts || {});
   }
+
+  /**
+   * Allows altering the topic title in the topic list, and in the topic view
+   *
+   * topicTitleType can be `topic-title` or `topic-list-item-title`
+   *
+   * For example, to replace the topic title:
+   *
+   * ```
+   * api.decorateTopicTitle(
+   *   (topicModel, node, topicTitleType) => {
+   *     node.innerText("my new topic title");
+   *   }
+   * );
+   * ```
+   *
+   **/
+  decorateTopicTitle(callback) {
+    addTopicTitleDecorator(callback);
+  }
 }
 
 let _pluginv01;
diff --git a/test/javascripts/acceptance/topic-test.js b/test/javascripts/acceptance/topic-test.js
index af05e5fc9e7..68e6ab2c8aa 100644
--- a/test/javascripts/acceptance/topic-test.js
+++ b/test/javascripts/acceptance/topic-test.js
@@ -1,3 +1,4 @@
+import { withPluginApi } from "discourse/lib/plugin-api";
 import selectKit from "helpers/select-kit-helper";
 import { acceptance } from "helpers/qunit-helpers";
 import { IMAGE_VERSION as v } from "pretty-text/emoji/version";
@@ -358,3 +359,30 @@ QUnit.test("Bookmarks Modal", async assert => {
   await click(".topic-post:first-child button.bookmark");
   assert.ok(exists("#bookmark-reminder-modal"), "it shows the bookmark modal");
 });
+
+acceptance("Topic with title decorated", {
+  loggedIn: true,
+  beforeEach() {
+    withPluginApi("0.8.40", api => {
+      api.decorateTopicTitle((topic, node, topicTitleType) => {
+        node.innerText = `${node.innerText}-${topic.id}-${topicTitleType}`;
+      });
+    });
+  }
+});
+
+QUnit.test("Decorate topic title", async assert => {
+  await visit("/t/internationalization-localization/280");
+
+  assert.ok(
+    find(".fancy-title")[0].innerText.endsWith("-280-topic-title"),
+    "it decorates topic title"
+  );
+
+  assert.ok(
+    find(".raw-topic-link:nth-child(1)")[0].innerText.endsWith(
+      "-27331-topic-list-item-title"
+    ),
+    "it decorates topic list item title"
+  );
+});
diff --git a/test/javascripts/helpers/qunit-helpers.js b/test/javascripts/helpers/qunit-helpers.js
index 4b6ed9330f3..e0621c294dd 100644
--- a/test/javascripts/helpers/qunit-helpers.js
+++ b/test/javascripts/helpers/qunit-helpers.js
@@ -16,6 +16,7 @@ import { clearRewrites } from "discourse/lib/url";
 import { initSearchData } from "discourse/widgets/search-menu";
 import { resetDecorators } from "discourse/widgets/widget";
 import { resetWidgetCleanCallbacks } from "discourse/components/mount-widget";
+import { resetTopicTitleDecorators } from "discourse/components/topic-title";
 import { resetDecorators as resetPostCookedDecorators } from "discourse/widgets/post-cooked";
 import { resetDecorators as resetPluginOutletDecorators } from "discourse/components/plugin-connector";
 import { resetCache as resetOneboxCache } from "pretty-text/oneboxer";
@@ -129,6 +130,7 @@ export function acceptance(name, options) {
       resetDecorators();
       resetPostCookedDecorators();
       resetPluginOutletDecorators();
+      resetTopicTitleDecorators();
       resetOneboxCache();
       resetCustomPostMessageCallbacks();
       Discourse._runInitializer("instanceInitializers", function(