Regan Tamanui is an artist based in Melbourne, Australia. In October 2000, he founded the Melbourne Stuckists, the fourth Stuckist of the original Stuckist groups and the first outside the United Kingdom. He has also painted prolifically as a street artist under the tag name HA-HA.

Stuckism is an international art movement founded in 1999 by Billy Childish and Charles Thomson to promote figurative painting as opposed to conceptual art. By May 2017 the initial group of 13 British artists had expanded to 236 groups in 52 countries.