diff --git a/app/assets/javascripts/discourse/app/components/sidebar/topics-section.js b/app/assets/javascripts/discourse/app/components/sidebar/topics-section.js
index e68fd2dafab..31a19ebc1fe 100644
--- a/app/assets/javascripts/discourse/app/components/sidebar/topics-section.js
+++ b/app/assets/javascripts/discourse/app/components/sidebar/topics-section.js
@@ -1,72 +1,31 @@
-import I18n from "I18n";
-
 import GlimmerComponent from "discourse/components/glimmer";
 import Composer from "discourse/models/composer";
 import { getOwner } from "discourse-common/lib/get-owner";
 import PermissionType from "discourse/models/permission-type";
-import discourseDebounce from "discourse-common/lib/debounce";
+import { customSectionLinks } from "discourse/lib/sidebar/custom-topics-section-links";
+import EverythingSectionLink from "discourse/lib/sidebar/topics-section/everything-section-link";
+import TrackedSectionLink from "discourse/lib/sidebar/topics-section/tracked-section-link";
+import BookmarkedSectionLink from "discourse/lib/sidebar/topics-section/bookmarked-section-link";
 
 import { action } from "@ember/object";
 import { next } from "@ember/runloop";
-import { tracked } from "@glimmer/tracking";
+
+const DEFAULT_SECTION_LINKS = [
+  EverythingSectionLink,
+  TrackedSectionLink,
+  BookmarkedSectionLink,
+];
 
 export default class SidebarTopicsSection extends GlimmerComponent {
-  @tracked totalUnread = 0;
-  @tracked totalNew = 0;
-
-  constructor(owner, args) {
-    super(owner, args);
-    this._refreshSectionCounts();
-
-    this.topicTrackingState.onStateChange(
-      this._topicTrackingStateUpdated.bind(this)
-    );
-  }
-
-  _topicTrackingStateUpdated() {
-    // refreshing section counts by looping through the states in topicTrackingState is an expensive operation so
-    // we debounce this.
-    discourseDebounce(this, this._refreshSectionCounts, 100);
-  }
-
-  _refreshSectionCounts() {
-    let totalUnread = 0;
-    let totalNew = 0;
-
-    this.topicTrackingState.forEachTracked((topic, isNew, isUnread) => {
-      if (isNew) {
-        totalNew += 1;
-      } else if (isUnread) {
-        totalUnread += 1;
+  get sectionLinks() {
+    return [...DEFAULT_SECTION_LINKS, ...customSectionLinks].map(
+      (sectionLinkClass) => {
+        return new sectionLinkClass({
+          topicTrackingState: this.topicTrackingState,
+          currentUser: this.currentUser,
+        });
       }
-    });
-
-    this.totalUnread = totalUnread;
-    this.totalNew = totalNew;
-  }
-
-  get everythingSectionLinkBadgeText() {
-    if (this.totalUnread > 0) {
-      return I18n.t("sidebar.unread_count", {
-        count: this.totalUnread,
-      });
-    } else if (this.totalNew > 0) {
-      return I18n.t("sidebar.new_count", {
-        count: this.totalNew,
-      });
-    } else {
-      return;
-    }
-  }
-
-  get everythingSectionLinkRoute() {
-    if (this.totalUnread > 0) {
-      return "discovery.unread";
-    } else if (this.totalNew > 0) {
-      return "discovery.new";
-    } else {
-      return "discovery.latest";
-    }
+    );
   }
 
   @action
diff --git a/app/assets/javascripts/discourse/app/lib/plugin-api.js b/app/assets/javascripts/discourse/app/lib/plugin-api.js
index 74aff2737d3..e586be839c6 100644
--- a/app/assets/javascripts/discourse/app/lib/plugin-api.js
+++ b/app/assets/javascripts/discourse/app/lib/plugin-api.js
@@ -94,6 +94,7 @@ import {
 import { CUSTOM_USER_SEARCH_OPTIONS } from "select-kit/components/user-chooser";
 import { downloadCalendar } from "discourse/lib/download-calendar";
 import { consolePrefix } from "discourse/lib/source-identifier";
+import { addSectionLink } from "discourse/lib/sidebar/custom-topics-section-links";
 
 // If you add any methods to the API ensure you bump up the version number
 // based on Semantic Versioning 2.0.0. Please update the changelog at
@@ -1622,6 +1623,44 @@ class PluginApi {
   customizeComposerText(callbacks) {
     registerCustomizationCallback(callbacks);
   }
+
+  /**
+   * EXPERIMENTAL. Do not use.
+   * Support for adding a link under Sidebar topics section by returning a class which extends from the BaseSectionLink
+   * class interface. See `lib/sidebar/topics-section/base-section-link.js` for documentation on the BaseSectionLink class
+   * interface.
+   *
+   * ```
+   * api.addTopicsSectionLink((baseSectionLink) => {
+   *   return class CustomSectionLink extends baseSectionLink {
+   *     get name() {
+   *       returns "bookmarked"
+   *     }
+   *
+   *     get route() {
+   *       returns "userActivity.bookmarks"
+   *     }
+   *
+   *     get title() {
+   *       return I18n.t("sidebar.sections.topics.links.bookmarked.title");
+   *     }
+   *
+   *     get text() {
+   *       return I18n.t("sidebar.sections.topics.links.bookmarked.content");
+   *     }
+   *   }
+   * })
+   * ```
+   *
+   * @callback addTopicsSectionLinkCallback
+   * @param {BaseSectionLink} baseSectionLink Factory class to inherit from.
+   * @returns {BaseSectionLink} A class that extends BaseSectionLink.
+   *
+   * @param {addTopicsSectionLinkCallback} callback
+   */
+  async addTopicsSectionLink(callback) {
+    addSectionLink(callback);
+  }
 }
 
 // from http://stackoverflow.com/questions/6832596/how-to-compare-software-version-number-using-js-only-number
diff --git a/app/assets/javascripts/discourse/app/lib/sidebar/custom-topics-section-links.js b/app/assets/javascripts/discourse/app/lib/sidebar/custom-topics-section-links.js
new file mode 100644
index 00000000000..22543a0a043
--- /dev/null
+++ b/app/assets/javascripts/discourse/app/lib/sidebar/custom-topics-section-links.js
@@ -0,0 +1,19 @@
+import BaseSectionLink from "discourse/lib/sidebar/topics-section/base-section-link";
+
+export let customSectionLinks = [];
+
+/**
+ * Appends an additional section link under the topics section
+ * @callback addSectionLinkCallback
+ * @param {BaseSectionLink} baseSectionLink Factory class to inherit from.
+ * @returns {BaseSectionLink} A class that extends BaseSectionLink.
+ *
+ * @param {addTopicsSectionLinkCallback} callback
+ */
+export function addSectionLink(callback) {
+  customSectionLinks.push(callback.call(this, BaseSectionLink));
+}
+
+export function resetDefaultSectionLinks() {
+  customSectionLinks = [];
+}
diff --git a/app/assets/javascripts/discourse/app/lib/sidebar/topics-section/base-section-link.js b/app/assets/javascripts/discourse/app/lib/sidebar/topics-section/base-section-link.js
new file mode 100644
index 00000000000..61ed6b53ac4
--- /dev/null
+++ b/app/assets/javascripts/discourse/app/lib/sidebar/topics-section/base-section-link.js
@@ -0,0 +1,63 @@
+/**
+ * Base class representing a sidebar topics section link interface.
+ */
+export default class BaseSectionLink {
+  constructor({ topicTrackingState, currentUser } = {}) {
+    this.topicTrackingState = topicTrackingState;
+    this.currentUser = currentUser;
+  }
+
+  /**
+   * @returns {string} The name of the section link
+   */
+  get name() {
+    this._notImplemented();
+  }
+
+  /**
+   * @returns {string} Ember route
+   */
+  get route() {
+    this._notImplemented();
+  }
+
+  /**
+   * @returns {Object} Model for <LinkTo> component. See https://api.emberjs.com/ember/release/classes/Ember.Templates.components/methods/LinkTo?anchor=LinkTo
+   */
+  get model() {}
+
+  /**
+   * @returns {Object} Query parameters for <LinkTo> component. See https://api.emberjs.com/ember/release/classes/Ember.Templates.components/methods/LinkTo?anchor=LinkTo
+   */
+  get query() {
+    return {};
+  }
+
+  /**
+   * @returns {String} current-when for <LinkTo> component. See https://api.emberjs.com/ember/release/classes/Ember.Templates.components/methods/LinkTo?anchor=LinkTo
+   */
+  get currentWhen() {}
+
+  /**
+   * @returns {string} Title for the link
+   */
+  get title() {
+    this._notImplemented();
+  }
+
+  /**
+   * @returns {string} Text for the link
+   */
+  get text() {
+    this._notImplemented();
+  }
+
+  /**
+   * @returns {string} Text for the badge within the link
+   */
+  get badgeText() {}
+
+  _notImplemented() {
+    throw "not implemented";
+  }
+}
diff --git a/app/assets/javascripts/discourse/app/lib/sidebar/topics-section/bookmarked-section-link.js b/app/assets/javascripts/discourse/app/lib/sidebar/topics-section/bookmarked-section-link.js
new file mode 100644
index 00000000000..bee631e2b60
--- /dev/null
+++ b/app/assets/javascripts/discourse/app/lib/sidebar/topics-section/bookmarked-section-link.js
@@ -0,0 +1,25 @@
+import I18n from "I18n";
+
+import BaseSectionLink from "discourse/lib/sidebar/topics-section/base-section-link";
+
+export default class BookmarkedSectionLink extends BaseSectionLink {
+  get name() {
+    return "bookmarked";
+  }
+
+  get route() {
+    return "userActivity.bookmarks";
+  }
+
+  get model() {
+    return this.currentUser;
+  }
+
+  get title() {
+    return I18n.t("sidebar.sections.topics.links.bookmarked.title");
+  }
+
+  get text() {
+    return I18n.t("sidebar.sections.topics.links.bookmarked.content");
+  }
+}
diff --git a/app/assets/javascripts/discourse/app/lib/sidebar/topics-section/everything-section-link.js b/app/assets/javascripts/discourse/app/lib/sidebar/topics-section/everything-section-link.js
new file mode 100644
index 00000000000..261364a76e4
--- /dev/null
+++ b/app/assets/javascripts/discourse/app/lib/sidebar/topics-section/everything-section-link.js
@@ -0,0 +1,87 @@
+import I18n from "I18n";
+
+import { tracked } from "@glimmer/tracking";
+
+import discourseDebounce from "discourse-common/lib/debounce";
+import BaseSectionLink from "discourse/lib/sidebar/topics-section/base-section-link";
+
+export default class EverythingSectionLink extends BaseSectionLink {
+  @tracked totalUnread = 0;
+  @tracked totalNew = 0;
+
+  constructor() {
+    super(...arguments);
+
+    this._refreshCounts();
+
+    this.topicTrackingState.onStateChange(
+      this._topicTrackingStateUpdated.bind(this)
+    );
+  }
+
+  _topicTrackingStateUpdated() {
+    // refreshing section counts by looping through the states in topicTrackingState is an expensive operation so
+    // we debounce this.
+    discourseDebounce(this, this._refreshCounts, 100);
+  }
+
+  _refreshCounts() {
+    let totalUnread = 0;
+    let totalNew = 0;
+
+    this.topicTrackingState.forEachTracked((topic, isNew, isUnread) => {
+      if (isNew) {
+        totalNew += 1;
+      } else if (isUnread) {
+        totalUnread += 1;
+      }
+    });
+
+    this.totalUnread = totalUnread;
+    this.totalNew = totalNew;
+  }
+
+  get name() {
+    return "everything";
+  }
+
+  get query() {
+    return { f: undefined };
+  }
+
+  get title() {
+    return I18n.t("sidebar.sections.topics.links.everything.title");
+  }
+
+  get text() {
+    return I18n.t("sidebar.sections.topics.links.everything.content");
+  }
+
+  get currentWhen() {
+    return "discovery.latest discovery.new discovery.unread discovery.top";
+  }
+
+  get badgeText() {
+    if (this.totalUnread > 0) {
+      return I18n.t("sidebar.unread_count", {
+        count: this.totalUnread,
+      });
+    } else if (this.totalNew > 0) {
+      return I18n.t("sidebar.new_count", {
+        count: this.totalNew,
+      });
+    } else {
+      return;
+    }
+  }
+
+  get route() {
+    if (this.totalUnread > 0) {
+      return "discovery.unread";
+    } else if (this.totalNew > 0) {
+      return "discovery.new";
+    } else {
+      return "discovery.latest";
+    }
+  }
+}
diff --git a/app/assets/javascripts/discourse/app/lib/sidebar/topics-section/tracked-section-link.js b/app/assets/javascripts/discourse/app/lib/sidebar/topics-section/tracked-section-link.js
new file mode 100644
index 00000000000..4822162fca0
--- /dev/null
+++ b/app/assets/javascripts/discourse/app/lib/sidebar/topics-section/tracked-section-link.js
@@ -0,0 +1,25 @@
+import I18n from "I18n";
+
+import BaseSectionLink from "discourse/lib/sidebar/topics-section/base-section-link";
+
+export default class TrackedSectionLink extends BaseSectionLink {
+  get name() {
+    return "tracked";
+  }
+
+  get route() {
+    return "discovery.latest";
+  }
+
+  get query() {
+    return { f: "tracked" };
+  }
+
+  get title() {
+    return I18n.t("sidebar.sections.topics.links.tracked.title");
+  }
+
+  get text() {
+    return I18n.t("sidebar.sections.topics.links.tracked.content");
+  }
+}
diff --git a/app/assets/javascripts/discourse/app/templates/components/sidebar/section-link.hbs b/app/assets/javascripts/discourse/app/templates/components/sidebar/section-link.hbs
index 70750f06eeb..049cf540b19 100644
--- a/app/assets/javascripts/discourse/app/templates/components/sidebar/section-link.hbs
+++ b/app/assets/javascripts/discourse/app/templates/components/sidebar/section-link.hbs
@@ -4,7 +4,7 @@
     @route={{@route}}
     @query={{@query}}
     @models={{if @model (array @model) (if @models @models (array))}}
-    @current-when={{@current-when}}
+    @current-when={{@currentWhen}}
     @title={{@title}}
   >
     {{@content}}
diff --git a/app/assets/javascripts/discourse/app/templates/components/sidebar/topics-section.hbs b/app/assets/javascripts/discourse/app/templates/components/sidebar/topics-section.hbs
index 7d394723c53..1c31a57a701 100644
--- a/app/assets/javascripts/discourse/app/templates/components/sidebar/topics-section.hbs
+++ b/app/assets/javascripts/discourse/app/templates/components/sidebar/topics-section.hbs
@@ -8,26 +8,15 @@
   @headerAction={{this.composeTopic}}
   @headerActionTitle={{i18n "sidebar.sections.topics.header_action_title"}}>
 
-  <Sidebar::SectionLink
-    @linkName="everything"
-    @route={{this.everythingSectionLinkRoute}}
-    @query={{hash f=undefined}}
-    @title={{i18n "sidebar.sections.topics.links.everything.title"}}
-    @content={{i18n "sidebar.sections.topics.links.everything.content"}}
-    @current-when={{"discovery.latest discovery.new discovery.unread discovery.top"}}
-    @badgeText={{this.everythingSectionLinkBadgeText}} />
-
-  <Sidebar::SectionLink
-    @linkName="tracked"
-    @route="discovery.latest"
-    @query={{hash f="tracked"}}
-    @title={{i18n "sidebar.sections.topics.links.tracked.title"}}
-    @content={{i18n "sidebar.sections.topics.links.tracked.content"}} />
-
-  <Sidebar::SectionLink
-    @linkName="bookmarked"
-    @route="userActivity.bookmarks"
-    @model={{this.currentUser}}
-    @title={{i18n "sidebar.sections.topics.links.bookmarked.title"}}
-    @content={{i18n "sidebar.sections.topics.links.bookmarked.content"}} />
+  {{#each this.sectionLinks as |sectionLink|}}
+    <Sidebar::SectionLink
+      @linkName={{sectionLink.name}}
+      @route={{sectionLink.route}}
+      @query={{sectionLink.query}}
+      @title={{sectionLink.title}}
+      @content={{sectionLink.text}}
+      @currentWhen={{sectionLink.currentWhen}}
+      @badgeText={{sectionLink.badgeText}}
+      @model={{sectionLink.model}} />
+  {{/each}}
 </Sidebar::Section>
diff --git a/app/assets/javascripts/discourse/tests/acceptance/sidebar-topics-section-test.js b/app/assets/javascripts/discourse/tests/acceptance/sidebar-topics-section-test.js
index f49f582d680..9bcfe629223 100644
--- a/app/assets/javascripts/discourse/tests/acceptance/sidebar-topics-section-test.js
+++ b/app/assets/javascripts/discourse/tests/acceptance/sidebar-topics-section-test.js
@@ -12,6 +12,7 @@ import {
 import { isLegacyEmber } from "discourse-common/config/environment";
 import topicFixtures from "discourse/tests/fixtures/discovery-fixtures";
 import { cloneJSON } from "discourse-common/lib/object";
+import { withPluginApi } from "discourse/lib/plugin-api";
 
 acceptance("Sidebar - Topics Section", function (needs) {
   needs.user({ experimental_sidebar_enabled: true });
@@ -407,4 +408,57 @@ acceptance("Sidebar - Topics Section", function (needs) {
       );
     }
   );
+
+  conditionalTest(
+    "adding section link via plugin API",
+    !isLegacyEmber(),
+    async function (assert) {
+      withPluginApi("1.2.0", (api) => {
+        api.addTopicsSectionLink((baseSectionLink) => {
+          return class CustomSectionLink extends baseSectionLink {
+            get name() {
+              return "user-summary";
+            }
+
+            get route() {
+              return "user.summary";
+            }
+
+            get model() {
+              return this.currentUser;
+            }
+
+            get title() {
+              return `${this.currentUser.username} summary`;
+            }
+
+            get text() {
+              return "my summary";
+            }
+          };
+        });
+      });
+
+      await visit("/");
+      await click(".sidebar-section-link-user-summary");
+
+      assert.strictEqual(
+        currentURL(),
+        "/u/eviltrout/summary",
+        "links to the right URL"
+      );
+
+      assert.strictEqual(
+        query(".sidebar-section-link-user-summary").textContent.trim(),
+        "my summary",
+        "displays the right text for the link"
+      );
+
+      assert.strictEqual(
+        query(".sidebar-section-link-user-summary").title,
+        "eviltrout summary",
+        "displays the right title for the link"
+      );
+    }
+  );
 });
diff --git a/app/assets/javascripts/discourse/tests/helpers/qunit-helpers.js b/app/assets/javascripts/discourse/tests/helpers/qunit-helpers.js
index 4261b2992d5..daa06030ec3 100644
--- a/app/assets/javascripts/discourse/tests/helpers/qunit-helpers.js
+++ b/app/assets/javascripts/discourse/tests/helpers/qunit-helpers.js
@@ -63,6 +63,7 @@ import {
   setTestPresence,
 } from "discourse/lib/user-presence";
 import PreloadStore from "discourse/lib/preload-store";
+import { resetDefaultSectionLinks as resetTopicsSectionLinks } from "discourse/lib/sidebar/custom-topics-section-links";
 
 const LEGACY_ENV = !setupApplicationTest;
 
@@ -186,6 +187,7 @@ function testCleanup(container, app) {
     clearPresenceCallbacks();
   }
   restoreBaseUri();
+  resetTopicsSectionLinks();
 }
 
 export function discourseModule(name, options) {