| 2013 ATP World Tour Finals | |
|---|---|
| Date | 4–11 November |
| Edition | 44th (singles) / 39th (doubles) |
| Category | ATP World Tour Finals |
| Draw | 8S / 8D |
| Prize money | $6,000,000 |
| Surface | Hard / indoor |
| Location | London, United Kingdom |
| Venue | O2 arena |
| Champions | |
| Singles | |
 Novak Djokovic | |
| Doubles | |
 David Marrero / Fernando Verdasco | |
The 2013 ATP World Tour Finals (also known as the 2013 Barclays ATP World Tour Finals for sponsorship reasons) was a men's tennis tournament that was played on indoor hard courts at the O2 Arena in London, United Kingdom, between 4 and 11 November 2013. It was the season-ending event for the best singles players and doubles teams of the 2013 ATP World Tour.