31st Union
| Formerly | 2K Silicon Valley (2019–2020) | 
|---|---|
| Company type | Division | 
| Founded | February 4, 2019 | 
| Founder | Michael Condrey | 
| Headquarters | , US | 
| Number of locations | 2 studios (2021) | 
| Key people | Michael Condrey | 
| Parent | 2K | 
| Website | thirtyfirstunion | 
31st Union is a video game development studio of 2K based in San Mateo, California, with a studio in Valencia, Spain. It was founded in February 2019, then provisionally named 2K Silicon Valley, with Sledgehammer Games co-founder Michael Condrey as its lead.