Joseph Waterhouse (February 1828 – 29 April 1881) was an English-born Australian Methodist minister and missionary in Fiji.
He is credited with having converted Seru Epenisa Cakobau, the chief of Bau and King of Fiji, to Christianity.
After two years in Australia he returned to Fiji in 1859 as chairman of the district and while touring the islands campaigned against cession to Britain.
Waterhouse was drowned when the SS Tararua was wrecked off the coast of Dunedin and was survived by his wife and ten children.
Waterhouse was a supporter of local teachers in Fiji and is said to have converted fierce cannibal Seru Epenisa Cakobau, who as Vunivalu of Bau (Paramount Chief of Bau) became King of Fiji when he formed the first unified Fijian state in 1871.