The Rocket dominated the final day, winning seven of the eight frames in the afternoon session and then sealing a resounding 18-8 victory with a 96 break in the first frame of the evening.
Victory moves him level with Ray Reardon and his hero Steve Davis on six world titles, one shy of Stephen Hendry's record of seven.
Watch moment Ronnie O'Sullivan clinches sixth World Snooker Championship title
Reaction came in from around the snooker world after O'Sullivan's stunning triumph.
Ronnie O'Sullivan: 'My World Snooker Championship dream has become a reality'