Ronald Antonio O'Sullivan (born 5 December 1975) is an English professional snooker player from Chigwell, Essex. He has won the World Snooker Championship seven times, a modern-era record he shares with Stephen Hendry. He has also won a record eight Masters and a record eight UK Championship titles, giving him 23 Triple Crown titles, more than any other player. He holds the record for the most ranking titles, with 41, and has been ranked world number one on five occasions. After winning amateur titles including the IBSF World Under-21 Snooker Championship, O'Sullivan turned professional in 1992, aged 16. He did so alongside John Higgins and Mark Williams, and the three players are known collectively as the "Class of '92". He won the 1993 UK Championship at age 17 to become the youngest ranking-event winner, a record that still stands. He is also the youngest winner of the Masters and the oldest winner of all three Triple Crown events. He has featured at the Crucible more times than any other player, with 34 appearances as of the 2026 event. O'Sullivan made his first competitive century break at age 10 and his first competitive maximum break at age 15. He was the first player to make 1,000 centuries in professional competition, and has since passed 1,300 centuries. He holds the record for the most officially recognised maximums in professional competition, with 17, and holds the Guinness World Record for the fastest competitive maximum, made in 5 minutes and 8 seconds at the 1997 World Championship. At the 2026 World Open, he made a 16-red clearance of 153, the highest break in professional snooker history. O'Sullivan has experienced depression, mood swings, and drug and alcohol abuse during his career. An outspoken and controversial figure on the professional tour, he has been disciplined several times by the World Professional Billiards and Snooker Association for his behaviour and comments. Away from the table, he has worked as a television pundit and has written crime novels, autobiographies, and a health and fitness book. He is the subject of the 2023 documentary film Ronnie O'Sullivan: The Edge of Everything. He was inducted into the World Snooker Tour Hall of Fame in 2012 and was appointed OBE in the 2016 New Year Honours. In 2025, he relocated to Dubai.
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