Sean Lock (born 22 April 1963) is an English comedian and actor. He began his comedy career as a stand-up comedian, and won the British Comedy Award in 2000 in the category of Best Live Comic, and was nominated for the Perrier Comedy Award.
Lock is well known for his appearances on television and radio. He has written material for such comics as Bill Bailey, Lee Evans and Mark Lamarr and was voted the 55th greatest stand-up comic on Channel 4's 100 Greatest Stand-Ups in 2007 and again in the updated 2010 list as the 19th greatest stand-up comic. He is probably best known for his role as a team captain on Channel 4 comedy panel show 8 Out of 10 Cats since it began in 2005.