Paul O'Sullivan (born 6 Dec 1959) is a New Zealand born thoroughbred racehorse trainer. O'Sullivan trained in partnership with his father, Dave O’Sullivan, for 17 years in New Zealand. He was the champion trainer in New Zealand on 11 occasions. O'Sullivan moved to Hong Kong to train in 2004. In 2010/11, O'Sullivan brought up his double century of winners in Hong Kong. In 2022 he finished there with 516 wins and total earnings of HK$525,837,109. Paul is the brother of New Zealand premiership winning jockey Lance O'Sullivan.