Rebecca Atkinson (born 31 July 1983) is an English actress. She plays Karen Maguire in Channel 4's Shameless since the shows inception and has also appeared in Life On Mars and Ideal BBC Three's new "multi-platform sitcom" Trexx and Flipside.

She has had minor parts in many shows, including playing Asia in four episodes of BBC comedy series Ideal, and two episodes of New Street Law, where she played a character named Susie Hardwick. She appeared in Heartbeat in 2002 and 2006 playing two different characters. Shows she has had a single appearance in include Life on Mars (The Stabbing), Holby City, The Bill, Doctors and The Royal. She has also appeared in Children's Ward at a young age.

She also appeared in the film adaptation of Kevin Sampson's Awaydays, released in 2009.

Atkinson grew up on Weaste Lane in Salford and went to All Souls primary school on Kintyre Avenue, which was also the primary school of Warrington Wolves prop Adrian Morley.

She attended the David Johnson Drama and taught dancing in Goostrey for The Glenda Ann School of Dancing before appearing on TV.