Paul David O'Sullivan (born 6 December 1959) is a New Zealand Thoroughbred racehorse trainer.
He is the brother of New Zealand premiership-winning jockey Lance O'Sullivan.
[citation needed] 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.