diff --git a/packages/eui/src-docs/src/actions/action_types.js b/packages/eui/src-docs/src/actions/action_types.js
index 07aa8e948fab..95ca9e6de823 100644
--- a/packages/eui/src-docs/src/actions/action_types.js
+++ b/packages/eui/src-docs/src/actions/action_types.js
@@ -2,7 +2,4 @@ export default {
   // Example nav actions
   REGISTER_SECTION: 'REGISTER_SECTION',
   UNREGISTER_SECTION: 'UNREGISTER_SECTION',
-
-  // Locale actions
-  TOGGLE_LOCALE: 'TOGGLE_LOCALE',
 };
diff --git a/packages/eui/src-docs/src/actions/index.js b/packages/eui/src-docs/src/actions/index.js
deleted file mode 100644
index 5c3431e4d431..000000000000
--- a/packages/eui/src-docs/src/actions/index.js
+++ /dev/null
@@ -1 +0,0 @@
-export { toggleLocale } from './locale_actions';
diff --git a/packages/eui/src-docs/src/actions/locale_actions.js b/packages/eui/src-docs/src/actions/locale_actions.js
deleted file mode 100644
index c306dc9b991b..000000000000
--- a/packages/eui/src-docs/src/actions/locale_actions.js
+++ /dev/null
@@ -1,8 +0,0 @@
-import ActionTypes from './action_types';
-
-export const toggleLocale = (locale) => ({
-  type: ActionTypes.TOGGLE_LOCALE,
-  data: {
-    locale,
-  },
-});
diff --git a/packages/eui/src-docs/src/components/guide_page/guide_page_chrome.js b/packages/eui/src-docs/src/components/guide_page/guide_page_chrome.js
index 223aee0cb906..7c339c921490 100644
--- a/packages/eui/src-docs/src/components/guide_page/guide_page_chrome.js
+++ b/packages/eui/src-docs/src/components/guide_page/guide_page_chrome.js
@@ -302,7 +302,5 @@ export class GuidePageChrome extends Component {
 
 GuidePageChrome.propTypes = {
   currentRoute: PropTypes.object.isRequired,
-  onToggleLocale: PropTypes.func.isRequired,
-  selectedLocale: PropTypes.string.isRequired,
   navigation: PropTypes.array.isRequired,
 };
diff --git a/packages/eui/src-docs/src/components/guide_page/guide_page_header.tsx b/packages/eui/src-docs/src/components/guide_page/guide_page_header.tsx
index f68018f3927a..9be1dc1bc8b6 100644
--- a/packages/eui/src-docs/src/components/guide_page/guide_page_header.tsx
+++ b/packages/eui/src-docs/src/components/guide_page/guide_page_header.tsx
@@ -21,15 +21,7 @@ import { VersionSwitcher } from './version_switcher';
 
 const GITHUB_URL = 'https://github.com/elastic/eui';
 
-export type GuidePageHeaderProps = {
-  onToggleLocale: () => {};
-  selectedLocale: string;
-};
-
-export const GuidePageHeader: React.FunctionComponent<GuidePageHeaderProps> = ({
-  onToggleLocale,
-  selectedLocale,
-}) => {
+export const GuidePageHeader = () => {
   const isMobileSize = useIsWithinBreakpoints(['xs', 's']);
 
   const logo = useMemo(() => {
@@ -112,18 +104,9 @@ export const GuidePageHeader: React.FunctionComponent<GuidePageHeaderProps> = ({
   }, [codesandbox, github]);
 
   const rightSideItems = isMobileSize
-    ? [
-        <GuideThemeSelector
-          onToggleLocale={onToggleLocale}
-          selectedLocale={selectedLocale}
-        />,
-        mobileMenu,
-      ]
+    ? [<GuideThemeSelector />, mobileMenu]
     : [
-        <GuideThemeSelector
-          onToggleLocale={onToggleLocale}
-          selectedLocale={selectedLocale}
-        />,
+        <GuideThemeSelector />,
         github,
         <GuideFigmaLink key="figma" />,
         codesandbox,
diff --git a/packages/eui/src-docs/src/components/guide_theme_selector/guide_theme_selector.tsx b/packages/eui/src-docs/src/components/guide_theme_selector/guide_theme_selector.tsx
index d474aad5de0a..30cbc9b2904e 100644
--- a/packages/eui/src-docs/src/components/guide_theme_selector/guide_theme_selector.tsx
+++ b/packages/eui/src-docs/src/components/guide_theme_selector/guide_theme_selector.tsx
@@ -15,14 +15,7 @@ import {
   EuiSwitchEvent,
 } from '../../../../src/components';
 
-type GuideThemeSelectorProps = {
-  onToggleLocale: Function;
-  selectedLocale: string;
-};
-
-export const GuideThemeSelector: React.FunctionComponent<
-  GuideThemeSelectorProps
-> = ({ onToggleLocale, selectedLocale }) => {
+export const GuideThemeSelector = () => {
   const context = useContext(ThemeContext);
   const euiThemeContext = useEuiTheme();
   const colorMode = context.colorMode ?? euiThemeContext.colorMode;
@@ -65,9 +58,9 @@ export const GuideThemeSelector: React.FunctionComponent<
     },
     location.host.includes('803') && {
       label: 'i18n testing',
-      checked: selectedLocale === 'en-xa',
+      checked: context.i18n === 'en-xa',
       onChange: (e: EuiSwitchEvent) =>
-        onToggleLocale(e.target.checked ? 'en-xa' : 'en'),
+        context.setContext({ i18n: e.target.checked ? 'en-xa' : 'en' }),
     },
   ];
 
diff --git a/packages/eui/src-docs/src/components/with_theme/language_selector.tsx b/packages/eui/src-docs/src/components/with_theme/language_selector.tsx
index aea26bd226bb..212fe0c271ee 100644
--- a/packages/eui/src-docs/src/components/with_theme/language_selector.tsx
+++ b/packages/eui/src-docs/src/components/with_theme/language_selector.tsx
@@ -2,11 +2,30 @@ import React, { useContext } from 'react';
 
 import { EuiButtonGroup } from '../../../../src/components';
 
-import {
-  ThemeContext,
-  theme_languages,
-  THEME_LANGUAGES,
-} from './theme_context';
+import { ThemeContext } from './theme_context';
+
+export const THEME_LANGUAGES = ['language--js', 'language--sass'] as const;
+
+export type ThemeLanguages = {
+  id: (typeof THEME_LANGUAGES)[number];
+  label: string;
+  title: string;
+};
+
+export const themeLanguagesOptions: ThemeLanguages[] = [
+  {
+    id: 'language--js',
+    label: 'CSS-in-JS',
+    title: 'Language selector: CSS-in-JS',
+  },
+  {
+    id: 'language--sass',
+    label: 'Sass',
+    title: 'Language selector: Sass',
+  },
+];
+
+const ids = themeLanguagesOptions.map(({ id }) => id);
 
 export const LanguageSelector = ({
   onChange,
@@ -17,7 +36,7 @@ export const LanguageSelector = ({
   const toggleIdSelected = themeContext.themeLanguage;
   const onLanguageChange = (optionId: string) => {
     themeContext.setContext({
-      themeLanguage: optionId as THEME_LANGUAGES['id'],
+      themeLanguage: optionId as ThemeLanguages['id'],
     });
     onChange?.(optionId);
   };
@@ -27,8 +46,10 @@ export const LanguageSelector = ({
       buttonSize="m"
       color="accent"
       legend="Language selector"
-      options={theme_languages}
-      idSelected={toggleIdSelected}
+      options={themeLanguagesOptions}
+      idSelected={
+        ids.includes(toggleIdSelected) ? toggleIdSelected : 'language--js'
+      }
       onChange={(id) => onLanguageChange(id)}
     />
   );
diff --git a/packages/eui/src-docs/src/components/with_theme/theme_context.tsx b/packages/eui/src-docs/src/components/with_theme/theme_context.tsx
index 0403dd01f640..519f90450af5 100644
--- a/packages/eui/src-docs/src/components/with_theme/theme_context.tsx
+++ b/packages/eui/src-docs/src/components/with_theme/theme_context.tsx
@@ -26,44 +26,28 @@ EUI_THEMES.forEach((theme) => {
 });
 const THEME_NAMES = EUI_THEMES.map(({ value }) => value);
 
-const URL_PARAM_KEY = 'themeLanguage';
-export type THEME_LANGUAGES = {
-  id: 'language--js' | 'language--sass';
-  label: string;
-  title: string;
-};
-export const theme_languages: THEME_LANGUAGES[] = [
-  {
-    id: 'language--js',
-    label: 'CSS-in-JS',
-    title: 'Language selector: CSS-in-JS',
-  },
-  {
-    id: 'language--sass',
-    label: 'Sass',
-    title: 'Language selector: Sass',
-  },
-];
-const THEME_LANGS = theme_languages.map(({ id }) => id);
+import { type ThemeLanguages } from './language_selector';
 
 export type ThemeContextType = {
   theme?: EUI_THEME['value'];
   colorMode?: EuiThemeColorModeStandard;
   highContrastMode?: boolean;
-  themeLanguage: THEME_LANGUAGES['id'];
+  i18n?: 'en' | 'en-xa';
+  themeLanguage: ThemeLanguages['id']; // TODO: Can likely be deleted once Sass is fully deprecated
   setContext: (context: Partial<State>) => void;
 };
 export const ThemeContext = React.createContext<ThemeContextType>({
   theme: undefined,
   colorMode: undefined,
   highContrastMode: undefined,
-  themeLanguage: THEME_LANGS[0],
+  themeLanguage: 'language--js',
+  i18n: 'en',
   setContext: () => {},
 });
 
 type State = Pick<
   ThemeContextType,
-  'theme' | 'colorMode' | 'highContrastMode' | 'themeLanguage'
+  'theme' | 'colorMode' | 'highContrastMode' | 'themeLanguage' | 'i18n'
 >;
 
 export class ThemeProvider extends React.Component<PropsWithChildren, State> {
@@ -81,12 +65,15 @@ export class ThemeProvider extends React.Component<PropsWithChildren, State> {
       ? localStorage.getItem('highContrastMode') === 'true'
       : undefined;
 
+    const i18n = (localStorage.getItem('i18n') as any) || 'en';
+
     const themeLanguage = this.getThemeLanguage();
 
     this.state = {
       theme,
       colorMode,
       highContrastMode,
+      i18n,
       themeLanguage,
     };
   }
@@ -100,6 +87,7 @@ export class ThemeProvider extends React.Component<PropsWithChildren, State> {
       'theme',
       'colorMode',
       'highContrastMode',
+      'i18n',
       'themeLanguage',
     ] as const;
 
@@ -123,41 +111,40 @@ export class ThemeProvider extends React.Component<PropsWithChildren, State> {
     // to specific docs, e.g. ?themeLanguage=js, ?themeLanguage=sass
     // Note that because of our hash router, this logic only works on page load/full reload
     const urlParams = window?.location?.href?.split('?')[1]; // Note: we can't use location.search because of our hash router
-    const fromUrlParam = new URLSearchParams(urlParams).get(URL_PARAM_KEY);
+    const fromUrlParam = new URLSearchParams(urlParams).get('themeLanguage');
     // Otherwise, obtain it from localStorage
-    const fromLocalStorage = localStorage.getItem(URL_PARAM_KEY);
+    const fromLocalStorage = localStorage.getItem('themeLanguage');
 
-    let themeLanguage = (
+    const themeLanguage = (
       fromUrlParam ? `language--${fromUrlParam}` : fromLocalStorage
-    ) as THEME_LANGUAGES['id'];
+    ) as ThemeLanguages['id'];
 
     // If not set by either param or storage, or an invalid value, use the default
-    if (!themeLanguage || !THEME_LANGS.includes(themeLanguage))
-      themeLanguage = THEME_LANGS[0];
-
-    return themeLanguage;
+    return themeLanguage || 'language--js';
   };
 
-  setThemeLanguageParam = (languageKey: THEME_LANGUAGES['id']) => {
+  setThemeLanguageParam = (languageKey: ThemeLanguages['id']) => {
     const languageValue = languageKey.replace('language--', ''); // Make our params more succinct
     const hash = window?.location?.hash?.split('?'); // Note: we can't use location.search because of our hash router
 
     const queryParams = hash[1];
     const params = new URLSearchParams(queryParams);
-    params.set(URL_PARAM_KEY, languageValue);
+    params.set('themeLanguage', languageValue);
 
     window.location.hash = `${hash[0]}?${params.toString()}`;
   };
 
   render() {
     const { children } = this.props;
-    const { theme, colorMode, highContrastMode, themeLanguage } = this.state;
+    const { theme, colorMode, highContrastMode, i18n, themeLanguage } =
+      this.state;
     return (
       <ThemeContext.Provider
         value={{
           theme,
           colorMode,
           highContrastMode,
+          i18n,
           themeLanguage,
           setContext: this.setContext,
         }}
diff --git a/packages/eui/src-docs/src/services/theme/theme.js b/packages/eui/src-docs/src/services/theme/theme.js
index 8f4e077b0918..316ac207bc6d 100644
--- a/packages/eui/src-docs/src/services/theme/theme.js
+++ b/packages/eui/src-docs/src/services/theme/theme.js
@@ -8,6 +8,5 @@ export function applyTheme(newTheme, colorMode = 'LIGHT') {
   Object.keys(themes).forEach((theme) =>
     Object.values(themes[theme]).forEach((cssFile) => cssFile.unuse())
   );
-  console.log(newTheme, themes[newTheme]?.[colorMode]);
   themes[newTheme]?.[colorMode]?.use();
 }
diff --git a/packages/eui/src-docs/src/store/configure_store.js b/packages/eui/src-docs/src/store/configure_store.js
index bcd8efc85404..0f4ea4addbf7 100644
--- a/packages/eui/src-docs/src/store/configure_store.js
+++ b/packages/eui/src-docs/src/store/configure_store.js
@@ -3,18 +3,13 @@ import thunk from 'redux-thunk';
 
 import Routes from '../routes';
 
-import localeReducer from './reducers/locale_reducer';
-import themeReducer from './reducers/theme_reducer';
-
 /**
  * @param {Object} initialState An object defining the application's initial
  * state.
  */
 export default function configureStore(initialState) {
-  function rootReducer(state = {}, action) {
+  function rootReducer() {
     return {
-      theme: themeReducer(state.theme, action),
-      locale: localeReducer(state.locale, action),
       routes: Routes,
     };
   }
diff --git a/packages/eui/src-docs/src/store/index.js b/packages/eui/src-docs/src/store/index.js
index 04ef96b83ea8..8421502c9c97 100644
--- a/packages/eui/src-docs/src/store/index.js
+++ b/packages/eui/src-docs/src/store/index.js
@@ -1,11 +1,3 @@
-export function getTheme(state) {
-  return state.theme.theme;
-}
-
 export function getRoutes(state) {
   return state.routes;
 }
-
-export function getLocale(state) {
-  return state.locale.locale;
-}
diff --git a/packages/eui/src-docs/src/views/app_context.js b/packages/eui/src-docs/src/views/app_context.js
index fdfda5b269d6..f5ecad2f8fba 100644
--- a/packages/eui/src-docs/src/views/app_context.js
+++ b/packages/eui/src-docs/src/views/app_context.js
@@ -1,10 +1,8 @@
 import React, { useContext } from 'react';
 import { Helmet } from 'react-helmet';
-import { useSelector } from 'react-redux';
 import createCache from '@emotion/cache';
 import { ThemeContext } from '../components';
 import { translateUsingPseudoLocale } from '../services';
-import { getLocale } from '../store';
 
 import { EuiContext, EuiProvider } from '../../../src/components';
 import {
@@ -33,18 +31,7 @@ const utilityCache = createCache({
 });
 
 export const AppContext = ({ children }) => {
-  const { theme, colorMode, highContrastMode } = useContext(ThemeContext);
-  const locale = useSelector((state) => getLocale(state));
-
-  const mappingFuncs = {
-    'en-xa': translateUsingPseudoLocale,
-  };
-
-  const i18n = {
-    mappingFunc: mappingFuncs[locale],
-    formatNumber: (value) => new Intl.NumberFormat(locale).format(value),
-    locale,
-  };
+  const { theme, colorMode, highContrastMode, i18n } = useContext(ThemeContext);
 
   const isLocalDev = window.location.host.includes('803');
   setEuiDevProviderWarning(isLocalDev ? 'error' : 'warn'); // Note: this can't be in a useEffect, otherwise it fires too late for style memoization warnings to error on page reload
@@ -85,7 +72,16 @@ export const AppContext = ({ children }) => {
           rel="stylesheet"
         />
       </Helmet>
-      <EuiContext i18n={i18n}>{children}</EuiContext>
+      <EuiContext
+        i18n={{
+          locale: i18n,
+          mappingFunc:
+            i18n === 'en-xa' ? translateUsingPseudoLocale : undefined,
+          formatNumber: (value) => new Intl.NumberFormat(i18n).format(value),
+        }}
+      >
+        {children}
+      </EuiContext>
     </EuiProvider>
   );
 };
diff --git a/packages/eui/src-docs/src/views/app_view.js b/packages/eui/src-docs/src/views/app_view.js
index 8911d2a8332e..91a094ef1437 100644
--- a/packages/eui/src-docs/src/views/app_view.js
+++ b/packages/eui/src-docs/src/views/app_view.js
@@ -1,9 +1,8 @@
 import React from 'react';
-import { useDispatch, useSelector } from 'react-redux';
+import { useSelector } from 'react-redux';
 import { useLocation } from 'react-router-dom';
-import { toggleLocale as _toggleLocale } from '../actions';
 import { GuidePageChrome, GuidePageHeader } from '../components';
-import { getLocale, getRoutes } from '../store';
+import { getRoutes } from '../store';
 import {
   useScrollToHash,
   useHeadingAnchorLinks,
@@ -17,9 +16,6 @@ import {
 } from '../../../src/components';
 
 export const AppView = ({ children, currentRoute = {} }) => {
-  const dispatch = useDispatch();
-  const toggleLocale = (locale) => dispatch(_toggleLocale(locale));
-  const locale = useSelector((state) => getLocale(state));
   const routes = useSelector((state) => getRoutes(state));
 
   const portalledHeadingAnchorLinks = useHeadingAnchorLinks();
@@ -43,7 +39,7 @@ export const AppView = ({ children, currentRoute = {} }) => {
         Skip to content
       </EuiSkipLink>
       {portalledHeadingAnchorLinks}
-      <GuidePageHeader onToggleLocale={toggleLocale} selectedLocale={locale} />
+      <GuidePageHeader />
       <EuiPageTemplate
         paddingSize="none"
         restrictWidth={false}
@@ -53,8 +49,6 @@ export const AppView = ({ children, currentRoute = {} }) => {
           <GuidePageChrome
             currentRoute={currentRoute}
             navigation={routes.navigation}
-            onToggleLocale={toggleLocale}
-            selectedLocale={locale}
           />
         </EuiPageTemplate.Sidebar>