Katherine Jane Parkinson (born 9 March 1977) is an English actress. She has appeared in several comedy series, including as Jen Barber in Channel 4's The IT Crowd, for which she received a British Comedy Best TV Actress Award in 2009 and a BAFTA TV Award in 2014 (having received a nomination in 2011).
She was also a main cast member of the series Doc Martin for three seasons, and performed the voice-overs for the games Worms Clan Wars and Worms Battlegrounds. She co-starred in Series 1 & 2 of Humans, a science-fiction drama on AMC/Channel 4, which premiered in June 2015.