Winston Blackmore is the leader of Canada’s largest polygamist group. For two decades, Blackmore was the Bishop of the Bountiful, British Columbia group of the Fundamentalist Church of Jesus Christ of Latter Day Saints (FLDS Church), a polygamist community in the Creston Valley. In September 2002, FLDS Church president Warren Jeffs excommunicated him. The community of Bountiful was split nearly in half—about 700 people continue to follow Blackmore, while about 500 follow Jeffs.

Blackmore was arrested by the Royal Canadian Mounted Police in January 2009 and charged with polygamy.

As of June 30, 2009, Blackmore has married 25 times and has a total of 101 children.