Kristian Woolf (born 6 July 1975) is an Australian professional rugby league football coach who is the head coach of Tonga at international level and the assistant coach of the Dolphins in the NRL. He previously was the head coach of St Helens whom he coached to the 2020, 2021 and the 2022 Super League Grand Final wins, four straight for the club and three straight for Woolf. He was also interim head coach of the Newcastle Knights in the National Rugby League.