| 12 Endeavour Square | |
| Map Type: | London |
| Former Names: | S5 |
| Alternate Names: | 1 Westfield Avenue |
| Status: | Complete |
| Building Type: | Office |
| Address: | 12 Endeavour Square 1 Westfield Avenue |
| Location City: | Stratford, London |
| Location Country: | England |
| Coordinates: | 51.5422°N -0.0094°W |
| Current Tenants: | Financial Conduct Authority UNICEF |
| Start Date: | May 2015 |
| Completion Date: | April 2018 |
| Owner: | DWS Group |
| Floor Count: | 20 |
| Floor Area: | 515000square feet |
| Elevator Count: | 8 |
| Architecture Firm: | Rogers Stirk Harbour + Partners |
| Developer: | Lendlease London & Continental Railways |
| Main Contractor: | Lendlease |
| Website: | www.twelveesq.com |
12 Endeavour Square, also known as 1 Westfield Avenue, is a commercial building within Stratford Cross in Stratford, London, occupied by the Financial Conduct Authority[1] and UNICEF.[2] It was completed in 2018, its developers were Lendlease and London & Continental Railways, and its architect was Rogers Stirk Harbour + Partners.[3]