Dean McDermott (born November 16, 1966 in Toronto, Ontario) is a Canadian actor best known for playing Constable Turnbull on the TV series Due South and for his marriage to Tori Spelling.

McDermott has appeared in many TV and movie roles, including the Kevin Costner film Open Range. He received a Gemini Nomination for Best Supporting Actor in 1997 for his portrayal of small town boy Garet French in Lives of Girls and Women. Since 2007, he and Spelling have co-starred in the reality series, Tori & Dean: Inn Love and "Tori & Dean: Home Sweet Hollywood".

McDermott married fellow Canadian and tv presenter/chef Mary Jo Eustace in July 1993. Their son Jack was born in October 10, 1998. In July 2005 they adopted a newborn daughter, Lola.