| 2012 ATP World Tour Finals | |
|---|---|
| Date | 5–12 November |
| Edition | 43rd (singles) / 38th (doubles) |
| Category | World Tour Finals |
| Draw | 8S / 8D |
| Prize money | $5,500,000 |
| Surface | Hard / indoor |
| Location | London, United Kingdom |
| Venue | O2 Arena |
| Champions | |
| Singles | |
 Novak Djokovic | |
| Doubles | |
 Marcel Granollers / Marc López | |
The 2012 ATP World Tour Finals (also known as the 2012 Barclays ATP World Tour Finals for sponsorship reasons) was a tennis tournament that was played at the O2 Arena in London, United Kingdom, between 5 and 12 November 2012.