Sebastian Spence (born December 9, 1969) is a Canadian actor best known for his roles as Cliff Harting on Hallmark's series Cedar Cove (2013-2015), and as Cade Foster in the Space Channel scifi series, First Wave (1998–2001).

His first on-camera role was in the second part of the Canadian TV miniseries, The Boys of St. Vincent. His next role was in the trilogy of A Family of Cops TV movies with Charles Bronson, playing Eddie Fein the younger son of Bronson's character. His first leading role was as Cade Foster, in the Space Channel (and later Sci-Fi Channel) original series, First Wave, which ran between 1998 and 2001. He later played the role of Cliff Harting on the Hallmark Channel drama Cedar Cove, between 2013 and 2015.