diff --git a/tools/theme/src/Theme.ts b/tools/theme/src/Theme.ts
index 07cd4d6cfe..c641cdf385 100755
--- a/tools/theme/src/Theme.ts
+++ b/tools/theme/src/Theme.ts
@@ -25,7 +25,6 @@ import {
     ShadowRootWithAdoptedStyleSheets,
     SYSTEM_VARIANT_VALUES,
     SystemVariant,
-    ThemeData,
     ThemeFragmentMap,
     ThemeKindProvider,
 } from './theme-interfaces';
@@ -298,10 +297,6 @@ export class Theme extends HTMLElement implements ThemeKindProvider {
         const node = document.importNode(Theme.template.content, true);
         this.shadowRoot.appendChild(node);
         this.shouldAdoptStyles();
-        this.addEventListener(
-            'sp-query-theme',
-            this.onQueryTheme as EventListener
-        );
         this.addEventListener(
             'sp-language-context',
             this._handleContextPresence as EventListener
@@ -317,21 +312,6 @@ export class Theme extends HTMLElement implements ThemeKindProvider {
             this.__resolve = resolve;
         });
     }
-    /* c8 ignore next 12 */
-    private onQueryTheme(event: CustomEvent<ThemeData>): void {
-        if (event.defaultPrevented) {
-            return;
-        }
-        event.preventDefault();
-        const { detail: theme } = event;
-        theme.color = this.color || undefined;
-        theme.scale = this.scale || undefined;
-        theme.lang =
-            this.lang || document.documentElement.lang || navigator.language;
-        // `theme` is deprecated in favor of `system` but maintaining `theme` as a deprecated path.
-        theme.theme = this.system || undefined;
-        theme.system = this.system || undefined;
-    }
 
     protected connectedCallback(): void {
         // Note, first update/render handles styleElement so we only call this if
diff --git a/tools/theme/src/theme-interfaces.ts b/tools/theme/src/theme-interfaces.ts
index ce958afe1a..eef8ea0187 100644
--- a/tools/theme/src/theme-interfaces.ts
+++ b/tools/theme/src/theme-interfaces.ts
@@ -60,14 +60,6 @@ export type Color = (typeof COLOR_VALUES)[number];
 
 export type FragmentName = Color | Scale | SystemVariant | 'core' | 'app';
 
-export interface ThemeData {
-    color?: Color;
-    scale?: Scale;
-    lang?: string;
-    theme?: SystemVariant;
-    system?: SystemVariant;
-}
-
 export type ThemeKindProvider = {
     [P in SettableFragmentTypes]: SystemVariant | Color | Scale | '';
 };