diff --git a/packages/core/src/destination-kit/index.ts b/packages/core/src/destination-kit/index.ts
index 99473fe05b8..2d82a87e402 100644
--- a/packages/core/src/destination-kit/index.ts
+++ b/packages/core/src/destination-kit/index.ts
@@ -239,6 +239,7 @@ interface AuthSettings<Settings> {
 interface RefreshAuthSettings<Settings> {
   settings: Settings
   auth: OAuth2ClientCredentials
+  features?: Features
 }
 
 interface Authentication<Settings> {
@@ -564,7 +565,8 @@ export class Destination<Settings = JSONObject, AudienceSettings = JSONObject> {
   async refreshAccessToken(
     settings: Settings,
     oauthData: OAuth2ClientCredentials,
-    synchronizeRefreshAccessToken?: () => Promise<void>
+    synchronizeRefreshAccessToken?: () => Promise<void>,
+    features?: Features
   ): Promise<RefreshAccessTokenResult | undefined> {
     if (!(this.authentication?.scheme === 'oauth2' || this.authentication?.scheme === 'oauth-managed')) {
       throw new IntegrationError(
@@ -590,7 +592,7 @@ export class Destination<Settings = JSONObject, AudienceSettings = JSONObject> {
     // Invoke synchronizeRefreshAccessToken handler if synchronizeRefreshAccessToken option is passed.
     // This will ensure that there is only one active refresh happening at a time.
     await synchronizeRefreshAccessToken?.()
-    return this.authentication.refreshAccessToken(requestClient, { settings, auth: oauthData })
+    return this.authentication.refreshAccessToken(requestClient, { settings, auth: oauthData, features })
   }
 
   private partnerAction(
@@ -1062,7 +1064,8 @@ export class Destination<Settings = JSONObject, AudienceSettings = JSONObject> {
     const newTokens = await this.refreshAccessToken(
       destinationSettings,
       oauthSettings,
-      options?.synchronizeRefreshAccessToken
+      options?.synchronizeRefreshAccessToken,
+      options?.features
     )
 
     if (!newTokens) {
diff --git a/packages/destination-actions/src/destinations/hubspot/__tests__/index.test.ts b/packages/destination-actions/src/destinations/hubspot/__tests__/index.test.ts
index 15b85a96bf0..b72292d2cff 100644
--- a/packages/destination-actions/src/destinations/hubspot/__tests__/index.test.ts
+++ b/packages/destination-actions/src/destinations/hubspot/__tests__/index.test.ts
@@ -5,6 +5,13 @@ import { HUBSPOT_BASE_URL } from '../properties'
 
 const testDestination = createTestIntegration(Definition)
 
+const oauthData = {
+  refreshToken: 'refresh-token',
+  accessToken: 'access-token',
+  clientId: 'client-id',
+  clientSecret: 'client-secret'
+}
+
 describe('HubSpot Cloud Mode (Actions)', () => {
   describe('testAuthentication', () => {
     it('should validate authentication inputs', async () => {
@@ -23,4 +30,37 @@ describe('HubSpot Cloud Mode (Actions)', () => {
       )
     })
   })
+
+  describe('refreshAccessToken', () => {
+    it('should use v1 endpoint when feature flag is not set', async () => {
+      nock(HUBSPOT_BASE_URL)
+        .post('/oauth/v1/token')
+        .reply(200, { access_token: 'new-access-token' })
+
+      const result = await testDestination.refreshAccessToken({}, oauthData)
+      expect(result).toEqual({ accessToken: 'new-access-token' })
+    })
+
+    it('should use v1 endpoint when feature flag is false', async () => {
+      nock(HUBSPOT_BASE_URL)
+        .post('/oauth/v1/token')
+        .reply(200, { access_token: 'new-access-token' })
+
+      const result = await testDestination.refreshAccessToken({}, oauthData, undefined, {
+        'actions-hubspot-oauth-v2': false
+      })
+      expect(result).toEqual({ accessToken: 'new-access-token' })
+    })
+
+    it('should use 2026-03 endpoint when feature flag is enabled', async () => {
+      nock(HUBSPOT_BASE_URL)
+        .post('/oauth/2026-03/token')
+        .reply(200, { access_token: 'new-access-token-v2' })
+
+      const result = await testDestination.refreshAccessToken({}, oauthData, undefined, {
+        'actions-hubspot-oauth-v2': true
+      })
+      expect(result).toEqual({ accessToken: 'new-access-token-v2' })
+    })
+  })
 })
diff --git a/packages/destination-actions/src/destinations/hubspot/index.ts b/packages/destination-actions/src/destinations/hubspot/index.ts
index b51276ff2f7..fe0213498e3 100644
--- a/packages/destination-actions/src/destinations/hubspot/index.ts
+++ b/packages/destination-actions/src/destinations/hubspot/index.ts
@@ -8,7 +8,7 @@ import upsertCustomObjectRecord from './upsertCustomObjectRecord'
 import upsertObject from './upsertObject'
 import customEvent from './customEvent'
 import { HUBSPOT_BASE_URL } from './properties'
-import { HUBSPOT_CRM_API_VERSION, HUBSPOT_OAUTH_API_VERSION } from './versioning-info'
+import { HUBSPOT_CRM_API_VERSION, HUBSPOT_OAUTH_API_VERSION, HUBSPOT_OAUTH_API_VERSION_NEXT_FLAGON } from './versioning-info'
 interface RefreshTokenResponse {
   access_token: string
 }
@@ -31,9 +31,9 @@ const destination: DestinationDefinition<Settings> = {
       // HubSpot doesn't have a test authentication endpoint, so we using a lightweight CRM API to validate access token
       return request(`${HUBSPOT_BASE_URL}/crm/${HUBSPOT_CRM_API_VERSION}/objects/contacts?limit=1`)
     },
-    refreshAccessToken: async (request, { auth }) => {
-      // Return a request that refreshes the access_token if the API supports it
-      const res = await request<RefreshTokenResponse>(`${HUBSPOT_BASE_URL}/oauth/${HUBSPOT_OAUTH_API_VERSION}/token`, {
+    refreshAccessToken: async (request, { auth, features }) => {
+      const oauthVersion = features?.['actions-hubspot-oauth-v2'] ? HUBSPOT_OAUTH_API_VERSION_NEXT_FLAGON : HUBSPOT_OAUTH_API_VERSION
+      const res = await request<RefreshTokenResponse>(`${HUBSPOT_BASE_URL}/oauth/${oauthVersion}/token`, {
         method: 'POST',
         body: new URLSearchParams({
           refresh_token: auth.refreshToken,
diff --git a/packages/destination-actions/src/destinations/hubspot/versioning-info.ts b/packages/destination-actions/src/destinations/hubspot/versioning-info.ts
index dd78826dd16..f8bd773babe 100644
--- a/packages/destination-actions/src/destinations/hubspot/versioning-info.ts
+++ b/packages/destination-actions/src/destinations/hubspot/versioning-info.ts
@@ -11,7 +11,13 @@ export const HUBSPOT_CRM_API_VERSION = 'v3'
 export const HUBSPOT_CRM_ASSOCIATIONS_API_VERSION = 'v4'
 
 /** HUBSPOT_OAUTH_API_VERSION
- * HubSpot OAuth API version.
+ * HubSpot OAuth API version (legacy).
  * API reference: https://developers.hubspot.com/docs/api-reference/auth-oauth-v1/tokens/post-oauth-v1-token
  */
 export const HUBSPOT_OAUTH_API_VERSION = 'v1'
+
+/** HUBSPOT_OAUTH_API_VERSION_NEXT_FLAGON
+ * HubSpot OAuth API version (2026-03).
+ * API reference: https://developers.hubspot.com/docs/api-reference/latest/authentication/manage-oauth-tokens
+ */
+export const HUBSPOT_OAUTH_API_VERSION_NEXT_FLAGON = '2026-03'