Callum Keith Rennie is a British-born Canadian actor, based in British Columbia. His breakthrough role was as punk rocker Billy Talent in the music mockumentary Hard Core Logo (1996), followed by a starring role as Det. Stanley Raymond Kowalski on the third and fourth seasons of the television series Due South (1997-99). He then won a Genie Award for Best Actor in a Supporting Role for his performance in the Don McKellar film Last Night (1998).

Rennie's television roles include Leoben Conoy on Battlestar Galactica (2003-09), Lew Ashby on Californication (2008-13), Rick Felder on The Killing (2011-12), Gary Connell on The Man in the High Castle (2016), Karl Malus on Jessica Jones (2018), and Commander Rayner on Star Trek: Discovery (2024). He won a Gemini Award for Best Actor in a Continuing Leading Dramatic Role for his portrayal of Detective Ben Sullivan on Shattered, and a second Genie Award for the film Normal (2007). He has also won four Leo Awards.