diff --git a/CHANGELOG.md b/CHANGELOG.md
index 82ec78cc5..c0704de1f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -36,6 +36,7 @@
 * Add `tr` Türkçe (Turkish) locale. Refs STCOR-1026.
 * Remove the `/users-keycloak/_self` (and `/bl-users/_self`) requests. They were included in `isAuthenticationRequest`, which caused them to bypass the RTR queue (`getPromise`). Fixes STCOR-1029.
 * Define a permission-set containing values necessary for session-init API requests. Refs STCOR-1031.
+* Use GET mod-settings `/locale` API to get tenant language & locale settings. Refs STCOR-1027.
 
 ## [11.0.0](https://github.com/folio-org/stripes-core/tree/v11.0.0) (2025-02-24)
 [Full Changelog](https://github.com/folio-org/stripes-core/compare/v10.2.0...v11.0.0)
diff --git a/src/loginServices.js b/src/loginServices.js
index 72ce4f463..0ac5579f1 100644
--- a/src/loginServices.js
+++ b/src/loginServices.js
@@ -327,77 +327,13 @@ export async function loadTranslations(store, locale, defaultTranslations = {})
  * @param {string} tenant
  * @returns {Promise}
  */
-async function dispatchLocale(url, store, tenant) {
-  const response = await fetch(url, {
-    headers: getHeaders(tenant, store.getState().okapi.token),
-    credentials: 'include',
-    mode: 'cors',
-  });
-
-  if (response.ok) {
-    const json = await response.json();
-    if (json.configs?.length) {
-      const localeValues = JSON.parse(json.configs[0].value);
-      const { locale, timezone, currency } = localeValues;
-      if (locale) {
-        await loadTranslations(store, locale);
-      }
-      if (timezone) store.dispatch(setTimezone(timezone));
-      if (currency) store.dispatch(setCurrency(currency));
-    }
+async function dispatchLocale(localeValues, store) {
+  const { locale, timezone, currency } = localeValues;
+  if (locale) {
+    await loadTranslations(store, locale);
   }
-
-  return response;
-}
-
-/**
- * getLocale
- * return a promise that retrieves the tenant's locale-settings then
- * loads the translations and dispatches the timezone and currency.
- * @param {string} okapiUrl
- * @param {redux store} store
- * @param {string} tenant
- *
- * @returns {Promise}
- */
-export async function getLocale(okapiUrl, store, tenant) {
-  const query = [
-    'module==ORG',
-    'configName == localeSettings',
-    '(cql.allRecords=1 NOT userId="" NOT code="")'
-  ].join(' AND ');
-
-  const res = await dispatchLocale(
-    `${okapiUrl}/configurations/entries?query=(${query})`,
-    store,
-    tenant
-  );
-
-  return res;
-}
-
-/**
- * getUserLocale
- * return a promise that retrieves the user's locale-settings then
- * loads the translations and dispatches the timezone and currency.
- * @param {*} okapiUrl
- * @param {*} store
- * @param {*} tenant
- *
- * @returns {Promise}
- */
-export async function getUserLocale(okapiUrl, store, tenant, userId) {
-  const query = Object.entries(userLocaleConfig)
-    .map(([k, v]) => `"${k}"=="${v}"`)
-    .join(' AND ');
-
-  const res = await dispatchLocale(
-    `${okapiUrl}/configurations/entries?query=(${query} and userId=="${userId}")`,
-    store,
-    tenant
-  );
-
-  return res;
+  if (timezone) store.dispatch(setTimezone(timezone));
+  if (currency) store.dispatch(setCurrency(currency));
 }
 
 /**
@@ -484,6 +420,7 @@ const fetchLocale = async (url, store, tenant) => {
   return res;
 };
 
+
 /**
  * Retrieves the tenant's locale setting from the mod-settings.
  *
@@ -496,15 +433,23 @@ const fetchLocale = async (url, store, tenant) => {
  * @returns {Promise} A promise that resolves with the locale configuration data.
  */
 const getTenantLocale = async (url, store, tenant) => {
-  const query = `scope=="${settings.SCOPE}" and key=="${tenantLocaleConfig.KEY}"`;
+  const response = await fetch(`${url}/locale`, {
+    headers: getHeaders(tenant, store.getState().okapi.token),
+    credentials: 'include',
+    mode: 'cors',
+  });
 
-  const res = await fetchLocale(
-    `${url}/settings/entries?query=(${query})`,
-    store,
-    tenant
-  );
+  if (response.ok) {
+    const locale = await response.json();
 
-  return res;
+    dispatchLocale(
+      locale,
+      store,
+      tenant
+    );
+  }
+
+  return response;
 };
 
 /**
@@ -523,13 +468,27 @@ const getTenantLocale = async (url, store, tenant) => {
 const getUserOwnLocale = async (url, store, tenant, userId) => {
   const query = `userId=="${userId}" and scope=="${settings.SCOPE}" and key=="${userOwnLocaleConfig.KEY}"`;
 
-  const res = await fetchLocale(
-    `${url}/settings/entries?query=(${query})`,
-    store,
-    tenant
-  );
+  const response = await fetch(`${url}/settings/entries?query=(${query})`, {
+    headers: getHeaders(tenant, store.getState().okapi.token),
+    credentials: 'include',
+    mode: 'cors',
+  });
 
-  return res;
+  if (response.ok) {
+    const json = await response.json();
+
+    if (json.items?.length) {
+      const localeValues = JSON.parse(json.items[0]?.value);
+
+      dispatchLocale(
+        localeValues,
+        store,
+        tenant
+      );
+    }
+  }
+
+  return response;
 };
 
 /**
@@ -584,7 +543,7 @@ export const getFullLocale = (languageRegion, numberingSystem) => {
  * @returns {Promise}
  */
 const processLocaleSettings = async (store, tenantLocaleData, userLocaleData) => {
-  const tenantLocaleSettings = tenantLocaleData?.items[0]?.value;
+  const tenantLocaleSettings = tenantLocaleData;
   const userLocaleSettings = userLocaleData?.items[0]?.value;
 
   const locale = userLocaleSettings?.locale || tenantLocaleSettings?.locale;
@@ -598,15 +557,6 @@ const processLocaleSettings = async (store, tenantLocaleData, userLocaleData) =>
   return res;
 };
 
-// This function is used to support the deprecated mod-configuration API.
-// It is only used when the new mod-settings API returns empty settings.
-const getLocalesPromise = (url, store, tenant, userId) => {
-  return Promise.all([
-    getLocale(url, store, tenant),
-    getUserLocale(url, store, tenant, userId),
-  ]);
-};
-
 /**
  * loadResources
  * return a promise that retrieves the tenant's locale, user's locale,
@@ -642,8 +592,8 @@ export async function loadResources(store, tenant, userId) {
       getTenantLocale(okapiUrl, store, tenant),
       getUserOwnLocale(okapiUrl, store, tenant, userId),
     ]);
-    const [tenantLocaleData, userLocaleData] = await Promise.all(responses.map(res => res.value?.json?.()));
-    hasSetting = tenantLocaleData?.items[0] || userLocaleData?.items[0];
+    const [tenantLocaleData, userLocaleData] = [responses];
+    hasSetting = tenantLocaleData || userLocaleData?.items[0].value;
 
     if (hasSetting) {
       await processLocaleSettings(store, tenantLocaleData, userLocaleData);
@@ -651,11 +601,6 @@ export async function loadResources(store, tenant, userId) {
     }
   }
 
-  // only read from legacy mod-config if we haven't already read from mod-settings
-  if (hasReadConfigPerm && !hasSetting) {
-    promises.push(getLocalesPromise(okapiUrl, store, tenant, userId));
-  }
-
   // tenant's locale, plugin, bindings, and user's locale are all stored
   // in mod-configuration so we can only retrieve them if the user has
   // read-permission for configuration entries.
diff --git a/src/loginServices.test.js b/src/loginServices.test.js
index 8853aeee3..192b5f847 100644
--- a/src/loginServices.test.js
+++ b/src/loginServices.test.js
@@ -3,13 +3,11 @@ import localforage from 'localforage';
 import {
   createOkapiSession,
   getBindings,
-  getLocale,
   getLoginTenant,
   getPlugins,
   getOkapiSession,
   getTokenExpiry,
   getUnauthorizedPathFromSession,
-  getUserLocale,
   handleLoginError,
   loadTranslations,
   logout,
@@ -662,36 +660,6 @@ describe('logout', () => {
   });
 });
 
-describe('getLocale', () => {
-  it('dispatches setTimezone, setCurrency', async () => {
-    const value = { timezone: 'America/New_York', currency: 'USD' };
-    mockFetchSuccess({ configs: [{ value: JSON.stringify(value) }] });
-    const store = {
-      dispatch: jest.fn(),
-      getState: () => ({ okapi: {} }),
-    };
-    await getLocale('url', store, 'tenant');
-    expect(store.dispatch).toHaveBeenCalledWith(setTimezone(value.timezone));
-    expect(store.dispatch).toHaveBeenCalledWith(setCurrency(value.currency));
-    mockFetchCleanUp();
-  });
-});
-
-describe('getUserLocale', () => {
-  it('dispatches setTimezone, setCurrency', async () => {
-    const value = { locale: 'en-US', timezone: 'America/New_York', currency: 'USD' };
-    mockFetchSuccess({ configs: [{ value: JSON.stringify(value) }] });
-    const store = {
-      dispatch: jest.fn(),
-      getState: () => ({ okapi: {} }),
-    };
-    await getUserLocale('url', store, 'tenant');
-    expect(store.dispatch).toHaveBeenCalledWith(setTimezone(value.timezone));
-    expect(store.dispatch).toHaveBeenCalledWith(setCurrency(value.currency));
-    mockFetchCleanUp();
-  });
-});
-
 describe('getPlugins', () => {
   it('dispatches setPlugins', async () => {
     const configs = [
@@ -905,15 +873,10 @@ describe('loadResources', () => {
   let loadResourcesResult;
 
   const tenantLocaleData = {
-    items: [{
-      id: 'tenantDataId',
-      value: {
-        locale: 'en-US',
-        numberingSystem: 'latn',
-        timezone: 'America/New_York',
-        currency: 'USD',
-      },
-    }],
+    locale: 'en-US',
+    numberingSystem: 'latn',
+    timezone: 'America/New_York',
+    currency: 'USD',
   };
 
   const userLocaleData = {
@@ -930,7 +893,7 @@ describe('loadResources', () => {
   };
 
   const getResponseData = (url) => {
-    if (url?.includes('key=="tenantLocaleSettings"')) return tenantLocaleData;
+    if (url?.includes('/locale')) return tenantLocaleData;
     if (url?.includes('key=="localeSettings"')) return userLocaleData;
 
     return { url };
@@ -978,11 +941,11 @@ describe('loadResources', () => {
         }));
       });
 
-      it('should fetch the tenant and user locale settings from mod-settings', async () => {
+      it('should fetch the tenant and user locale settings from mod-settings locale API', async () => {
         await loadResources(store, 'tenant', 'userId');
 
         expect(global.fetch).toHaveBeenCalledWith(
-          'http://okapi-url/settings/entries?query=(scope=="stripes-core.prefs.manage" and key=="tenantLocaleSettings")',
+          'http://okapi-url/locale',
           expect.anything(),
         );
         expect(global.fetch).toHaveBeenCalledWith(
@@ -1021,7 +984,7 @@ describe('loadResources', () => {
         loadResourcesResult = await loadResources(store, 'tenant', 'userId');
 
         expect(loadResourcesResult.map(({ url }) => url)).toEqual([
-          'http://okapi-url/settings/entries?query=(scope=="stripes-core.prefs.manage" and key=="tenantLocaleSettings")',
+          'http://okapi-url/locale',
           'http://okapi-url/settings/entries?query=(userId=="userId" and scope=="stripes-core.prefs.manage" and key=="localeSettings")',
           'http://okapi-url/configurations/entries?query=(module==PLUGINS)',
           'http://okapi-url/configurations/entries?query=(module==ORG and configName==bindings)',
@@ -1049,80 +1012,6 @@ describe('loadResources', () => {
         });
       });
     });
-
-    describe('when the user or tenant locale settings are not present in mod-settings', () => {
-      const getData = (url) => {
-        // if mod-settings API
-        if (url?.includes('key=="tenantLocaleSettings"') || url?.includes('key=="localeSettings"')) {
-          return { url, items: [] };
-        }
-
-        // if mod-configuration API
-        if (url?.includes('configName == localeSettings') || url?.includes('"configName"=="localeSettings"')) {
-          return {
-            url,
-            configs: [{
-              value: JSON.stringify({
-                locale: 'en-GB-u-nu-latn',
-                timezone: 'UTC',
-                currency: 'USD'
-              }),
-            }],
-          };
-        }
-
-        return { url };
-      };
-
-      beforeEach(() => {
-        global.fetch = jest.fn().mockImplementation((url) => Promise.resolve({
-          url,
-          json: () => Promise.resolve(getData(url)),
-          ok: true,
-        }));
-      });
-
-      it('should fetch the tenant and user locale settings from mod-settings and mod-configuration', async () => {
-        await loadResources(store, 'tenant', 'userId');
-
-        expect(global.fetch).toHaveBeenCalledWith(
-          'http://okapi-url/settings/entries?query=(scope=="stripes-core.prefs.manage" and key=="tenantLocaleSettings")',
-          expect.anything(),
-        );
-        expect(global.fetch).toHaveBeenCalledWith(
-          'http://okapi-url/settings/entries?query=(userId=="userId" and scope=="stripes-core.prefs.manage" and key=="localeSettings")',
-          expect.anything(),
-        );
-        expect(global.fetch).toHaveBeenCalledWith(
-          'http://okapi-url/configurations/entries?query=(module==ORG AND configName == localeSettings AND (cql.allRecords=1 NOT userId="" NOT code=""))',
-          expect.anything(),
-        );
-        expect(global.fetch).toHaveBeenCalledWith(
-          'http://okapi-url/configurations/entries?query=("configName"=="localeSettings" AND "module"=="@folio/stripes-core" and userId=="userId")',
-          expect.anything(),
-        );
-      });
-
-      it('should apply locale settings from mod-configuration', async () => {
-        await loadResources(store, 'tenant', 'userId');
-
-        expect(store.dispatch).toHaveBeenCalledWith(setTimezone('UTC'));
-        expect(store.dispatch).toHaveBeenCalledWith(setCurrency('USD'));
-        expect(document.documentElement.lang).toBe('en-GB-u-nu-latn');
-      });
-
-      it('should retrieve tenant-locale, user-locale, plugins, and bindings from configurations', async () => {
-        loadResourcesResult = await loadResources(store, 'tenant', 'userId');
-
-        expect(loadResourcesResult.map(({ url }) => url)).toEqual([
-          'http://okapi-url/configurations/entries?query=(module==ORG AND configName == localeSettings AND (cql.allRecords=1 NOT userId="" NOT code=""))',
-          'http://okapi-url/configurations/entries?query=("configName"=="localeSettings" AND "module"=="@folio/stripes-core" and userId=="userId")',
-          'http://okapi-url/configurations/entries?query=(module==PLUGINS)',
-          'http://okapi-url/configurations/entries?query=(module==ORG and configName==bindings)',
-          'discoverServices',
-        ]);
-      });
-    });
   });
 
   describe('when there is permission to only read tenant settings from mod-settings', () => {
@@ -1153,7 +1042,7 @@ describe('loadResources', () => {
       await loadResources(store, 'tenant', 'userId');
 
       expect(global.fetch).toHaveBeenCalledWith(
-        'http://okapi-url/settings/entries?query=(scope=="stripes-core.prefs.manage" and key=="tenantLocaleSettings")',
+        'http://okapi-url/locale',
         expect.anything(),
       );
       expect(global.fetch).toHaveBeenCalledWith(
@@ -1176,8 +1065,8 @@ describe('loadResources', () => {
     });
 
     it('should apply tenant locale settings', async () => {
-      const timezone = tenantLocaleData.items[0].value.timezone;
-      const currency = tenantLocaleData.items[0].value.currency;
+      const timezone = tenantLocaleData.timezone;
+      const currency = tenantLocaleData.currency;
 
       await loadResources(store, 'tenant', 'userId');
 
@@ -1190,7 +1079,7 @@ describe('loadResources', () => {
       loadResourcesResult = await loadResources(store, 'tenant', 'userId');
 
       expect(loadResourcesResult.map(({ url } = {}) => url)).toEqual([
-        'http://okapi-url/settings/entries?query=(scope=="stripes-core.prefs.manage" and key=="tenantLocaleSettings")',
+        'http://okapi-url/locale',
         undefined, // rejected request for user locale
         'discoverServices',
       ]);
@@ -1237,7 +1126,7 @@ describe('loadResources', () => {
       await loadResources(store, 'tenant', 'userId');
 
       expect(global.fetch).not.toHaveBeenCalledWith(
-        'http://okapi-url/settings/entries?query=(scope=="stripes-core.prefs.manage" and key=="tenantLocaleSettings")',
+        'http://okapi-url/locale',
         expect.anything(),
       );
       expect(global.fetch).not.toHaveBeenCalledWith(
@@ -1246,19 +1135,6 @@ describe('loadResources', () => {
       );
     });
 
-    it('should fetch the tenant and user locale settings from mod-configuration', async () => {
-      await loadResources(store, 'tenant', 'userId');
-
-      expect(global.fetch).toHaveBeenCalledWith(
-        'http://okapi-url/configurations/entries?query=(module==ORG AND configName == localeSettings AND (cql.allRecords=1 NOT userId="" NOT code=""))',
-        expect.anything(),
-      );
-      expect(global.fetch).toHaveBeenCalledWith(
-        'http://okapi-url/configurations/entries?query=("configName"=="localeSettings" AND "module"=="@folio/stripes-core" and userId=="userId")',
-        expect.anything(),
-      );
-    });
-
     it('should fetch the plugins and bindings', async () => {
       await loadResources(store, 'tenant', 'userId');
 
@@ -1272,20 +1148,10 @@ describe('loadResources', () => {
       );
     });
 
-    it('should apply locale settings', async () => {
-      await loadResources(store, 'tenant', 'userId');
-
-      expect(store.dispatch).toHaveBeenCalledWith(setTimezone('UTC'));
-      expect(store.dispatch).toHaveBeenCalledWith(setCurrency('USD'));
-      expect(document.documentElement.lang).toBe('en-GB-u-nu-latn');
-    });
-
-    it('should retrieve tenant-locale, user-locale, plugins, and bindings from configurations', async () => {
+    it('should retrieve plugins and bindings from configurations', async () => {
       loadResourcesResult = await loadResources(store, 'tenant', 'userId');
 
       expect(loadResourcesResult.map(({ url }) => url)).toEqual([
-        'http://okapi-url/configurations/entries?query=(module==ORG AND configName == localeSettings AND (cql.allRecords=1 NOT userId="" NOT code=""))',
-        'http://okapi-url/configurations/entries?query=("configName"=="localeSettings" AND "module"=="@folio/stripes-core" and userId=="userId")',
         'http://okapi-url/configurations/entries?query=(module==PLUGINS)',
         'http://okapi-url/configurations/entries?query=(module==ORG and configName==bindings)',
         'discoverServices',