Mark Douglas Brown McKinney (born June 26, 1959) is a Canadian comedian and actor, best known for his work in the long-running sketch comedy troupe The Kids in the Hall. Following the run of their television series (1989 to 1995) and feature film (Brain Candy), he went on to star in Saturday Night Live from 1995 to 1997. From 2003 to 2006, he co-created, wrote and starred in the acclaimed mini-series Slings and Arrows, a TV show about a Canadian theatre company struggling to survive while a crazy genius director haunted by his dead mentor helps the actors find authenticity in their acting.

Mark was born to Russell, a Canadian diplomat, and Chloe, an architectural writer, McKinney. Since his dad was a diplomat Mark and his siblings spent most of their childhood traveling with him. Mark's younger brother, Nick, is also a comedian and appeared on the short lived Comedy Central sketch comedy show The Vacant Lot. Mark attended a number of schools in cities around the world while traveling with his father, including Trinidad, Paris, and Washington D.C. He met Bruce McCulloch at the Loose Moose Theater Company, and the two joined with two other comedians to form the comedy troupe, 'The Audience', which performed at Theatresports. Later, Mark moved with Bruce to Toronto and met Dave Foley (I) and Kevin McDonald (I). They combined to form The Kids In the Hall. He then later starred in the TV cult sensation, "Kids in the Hall, The" (1988) . After the show was canceled in 1994, Mark became a cast member of "Saturday Night Live" (1975) from 1995 to 1997. Mark had roles in various movies including Night at the Roxbury, A (1998), Out-of-Towners, The (1999), Ladies Man, The (2000) and Dog Park (1998) and Superstar (1999) which were both directed by Kids In The Hall co-star and friend Bruce McCulloch.