William Warbrick (c. 1866 – 28 October 1901) was a New Zealand rugby union footballer who toured with the 1888–89 New Zealand Native football team on their 107-match tour of New Zealand, Australia, and the British Isles. Playing at fullback, he was one of five Warbrick brothers who participated in the tour, which was captained and organised by his half-brother Joe. Following the tour Warbrick moved to Australia where he played for Queensland, and then New South Wales. He also coached Australia in their first ever Test match—against the British Isles in 1899.