Rebecca Atkinson (born 22 September 1983) is an English actress, known for portraying Karen Maguire in Shameless from 2004 until 2013

Atkinson studied theatre and dance at Preston College

Before her television appearances, Atkinson attended the David Johnson Drama and taught dancing in Goostrey for the Glenda Ann School of Dancing.

In 2004, Atkinson began playing Karen Maguire in Channel 4's popular comedy drama series, Shameless, and appeared in all 11 series. She has also appeared in Life On Mars, Ideal and BBC Three sitcom Trexx and Flipside. In October 2016, Atkinson joined the cast of BBC Scotland soap opera, River City, as Belinda Roberts.

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. She has also had single appearances in Life on Mars, Holby City, The Bill, Coronation Street, Doctors and The Royal. She appeared in Children's Ward. She also appeared in the film adaptation of Kevin Sampson's Awaydays, released in 2009. She has now had a role in Wait For Me (2023) playing Lisa.