Ian Collier (died 1 October 2008) was a British actor. Collier appeared on stage in "Hamlet" in 1969 at the Lunt-Fontanne in New York City. He appeared in various television programmes including Rentaghost, Hi-de-Hi! and Howards' Way. He appeared in the Doctor Who story The Time Monster. Later he became the second actor to portray the villain Omega (the first being Stephen Thorne): Collier portrayed Omega in the Fifth Doctor serial Arc of Infinity and later in the Big Finish Productions audio drama Omega. He also played Doctor Who companion Bernice Summerfield's father, Isaac Summerfield, in Death and the Daleks, and he guest starred in the Big Finish Productions Doctor Who audio drama Excelis Decays.
Among his other television appearances was a guest part in an episode of Are You Being Served? in 1985.
Ian Collier died on 1 October 2008 of unspecified causes.