diff --git a/hassio/src/supervisor-base-element.ts b/hassio/src/supervisor-base-element.ts
index a5d3fbb7f6..7d9ee78d07 100644
--- a/hassio/src/supervisor-base-element.ts
+++ b/hassio/src/supervisor-base-element.ts
@@ -25,7 +25,7 @@ import {
 } from "../../src/data/supervisor/supervisor";
 import { ProvideHassLitMixin } from "../../src/mixins/provide-hass-lit-mixin";
 import { urlSyncMixin } from "../../src/state/url-sync-mixin";
-import { HomeAssistant, Route } from "../../src/types";
+import { HomeAssistant, Route, TranslationDict } from "../../src/types";
 import { getTranslation } from "../../src/util/common-translation";
 
 declare global {
@@ -124,9 +124,13 @@ export class SupervisorBaseElement extends urlSyncMixin(
 
     this.supervisor = {
       ...this.supervisor,
-      localize: await computeLocalize(this.constructor.prototype, language, {
-        [language]: data,
-      }),
+      localize: await computeLocalize<TranslationDict["supervisor"]>(
+        this.constructor.prototype,
+        language,
+        {
+          [language]: data,
+        }
+      ),
     };
   }
 
diff --git a/src/common/translations/localize.ts b/src/common/translations/localize.ts
index f82d6f0e38..13c3b8c920 100644
--- a/src/common/translations/localize.ts
+++ b/src/common/translations/localize.ts
@@ -3,10 +3,41 @@ import { shouldPolyfill as shouldPolyfillPluralRules } from "@formatjs/intl-plur
 import { shouldPolyfill as shouldPolyfillRelativeTime } from "@formatjs/intl-relativetimeformat/lib/should-polyfill";
 import { shouldPolyfill as shouldPolyfillDateTime } from "@formatjs/intl-datetimeformat/lib/should-polyfill";
 import IntlMessageFormat from "intl-messageformat";
-import { Resources } from "../../types";
+import { Resources, TranslationDict } from "../../types";
 import { getLocalLanguage } from "../../util/common-translation";
 
-export type LocalizeFunc = (key: string, ...args: any[]) => string;
+// Exclude some patterns from key type checking for now
+// These are intended to be removed as errors are fixed
+// Fixing component category will require tighter definition of types from backend and/or web socket
+type LocalizeKeyExceptions =
+  | `${string}`
+  | `panel.${string}`
+  | `state.${string}`
+  | `state_attributes.${string}`
+  | `state_badge.${string}`
+  | `groups.${string}`
+  | `config_entry.${string}`
+  | `ui.${string}`
+  | `${keyof TranslationDict["supervisor"]}.${string}`
+  | `component.${string}`;
+
+// Tweaked from https://www.raygesualdo.com/posts/flattening-object-keys-with-typescript-types
+type FlattenObjectKeys<
+  T extends Record<string, any>,
+  Key extends keyof T = keyof T
+> = Key extends string
+  ? T[Key] extends Record<string, unknown>
+    ? `${Key}.${FlattenObjectKeys<T[Key]>}`
+    : `${Key}`
+  : never;
+
+export type LocalizeFunc<
+  Dict extends Record<string, unknown> = TranslationDict
+> = (
+  key: FlattenObjectKeys<Dict> | LocalizeKeyExceptions,
+  ...args: any[]
+) => string;
+
 interface FormatType {
   [format: string]: any;
 }
@@ -65,12 +96,14 @@ export const polyfillsLoaded =
  * }
  */
 
-export const computeLocalize = async (
+export const computeLocalize = async <
+  Dict extends Record<string, unknown> = TranslationDict
+>(
   cache: any,
   language: string,
   resources: Resources,
   formats?: FormatsType
-): Promise<LocalizeFunc> => {
+): Promise<LocalizeFunc<Dict>> => {
   if (polyfillsLoaded) {
     await polyfillsLoaded;
   }
diff --git a/src/data/supervisor/supervisor.ts b/src/data/supervisor/supervisor.ts
index 965d51506b..62812b2c59 100644
--- a/src/data/supervisor/supervisor.ts
+++ b/src/data/supervisor/supervisor.ts
@@ -1,7 +1,7 @@
 import { Connection, getCollection } from "home-assistant-js-websocket";
 import { Store } from "home-assistant-js-websocket/dist/store";
 import { LocalizeFunc } from "../../common/translations/localize";
-import { HomeAssistant } from "../../types";
+import { HomeAssistant, TranslationDict } from "../../types";
 import { HassioAddonsInfo } from "../hassio/addon";
 import { HassioHassOSInfo, HassioHostInfo } from "../hassio/host";
 import { NetworkInfo } from "../hassio/network";
@@ -67,7 +67,7 @@ export interface Supervisor {
   os: HassioHassOSInfo;
   addon: HassioAddonsInfo;
   store: SupervisorStore;
-  localize: LocalizeFunc;
+  localize: LocalizeFunc<TranslationDict["supervisor"]>;
 }
 
 export const supervisorApiWsRequest = <T>(
diff --git a/src/types.ts b/src/types.ts
index b6bab9a982..62f6e89366 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -151,6 +151,8 @@ export interface TranslationMetadata {
   };
 }
 
+export type TranslationDict = typeof import("./translations/en.json");
+
 export interface IconMetaFile {
   version: string;
   parts: IconMeta[];