Justin Holbrook (born 13 January 1976) is an Australian professional rugby league coach who is the head coach of the Gold Coast Titans in the NRL, and a former player. He will take on the role of head coach of the Gold Coast Titans ahead of the 2020 NRL season.
He played as a goal-kicking halfback in the 1990s and 2000s for the Newcastle Knights, Penrith Panthers and the Sydney Roosters in the NRL.
He was appointed to replace Keiron Cunningham as head coach of English Super League club St. Helens on a three-year contract in May 2017.