Cal MacAninch is a Scottish actor, who is known for portraying the character of DI John Keenan in police drama HolbyBlue on BBC1 (from 2007 to 2008). Other notable appearances were his roles as Mr Thackeray in the ITV period drama, Mr Selfridge, and Henry Lang in Downton Abbey, but he has played many leading roles in British television and film over the last 30 years.

MacAninch played Rowan Collins in Series 4 of the ITV drama series Wild at Heart. He returned to the show for its fifth series as a main cast member. He also played Tauren, a sorcerer in the BBC television series Merlin in the episode "To Kill the King". He starred in the 2001 BBC miniseries The Best of Both Worlds with Alice Evans. He appeared as Henry Lang, a valet, in the second series of Downton Abbey.