The 2015 ATP World Tour was the global elite professional tennis circuit organized by the Association of Tennis Professionals (ATP) for the 2015 tennis season. The 2015 ATP World Tour calendar comprises the Grand Slam tournaments (supervised by the International Tennis Federation), the ATP World Tour Masters 1000, the ATP World Tour 500 series, the ATP World Tour 250 series, the Davis Cup (organized by the ITF) and the ATP World Tour Finals. Also included in the 2015 calendar is the Hopman Cup, which is organized by the ITF and does not distribute ranking points.