John Grey "Jack" Taiaroa (16 September 1862 – 31 December 1907), of Ngāi Tahu descent, was a New Zealand rugby union player. A halfback, he played nine matches for the New Zealand national team in 1884—the warm-up in Wellington and all eight matches of the tour of New South Wales; New Zealand won all eight games. There were no test matches on the tour, as there was not yet an Australian national team, and would not be until 1903.