Karen Patricia Buck (born August 30, 1958, Castlederg, County Tyrone, Northern Ireland) has been the Labour member of Parliament for Regent's Park and Kensington North since 1997.

She worked in local government and as a Labour Party campaign strategist before entering Parliament, and served on Westminster City Council from 1990. In Parliament she has specialised in issues of social security and welfare benefits.

In 2001 her appointment as a junior Government whip was announced without her knowledge and consent. She declined to take up the post.

sv:Karen Buck