Jonathan Kerrigan (born 14 October 1972 in Lincolnshire) is an English actor well known for his portrayal of gay nurse Sam Colloby in the BBC medical dramas Casualty and Holby City, and as police officers in the series Merseybeat and Heartbeat.

As well as starring in Merseybeat, Kerrigan also composed the theme tune.BBC Drama Faces - Jonathan Kerrigan, retrieved 24 September 2008

In April 2007, Jonathan announced his decision to quit his role as PC Rob Walker, (whom he had played since 2004) in long-running Yorkshire drama Heartbeat. Scottish actor Joseph McFadden replaced him as village constable Joe Mason in the following series of the show.

Jonathan currently lives in Kentish Town, North London, UK, with his partner Shelley Conn, whom he met on the set of Merseybeat "Jon's Conn Trick", The Mirror, 9 December 2002, retrieved 24 September 2008. He previously had a high-profile relationship with his Casualty co-star, Claire Goose.