Ian Gordon Arthur Collier (25 January 1943 – 1 October 2008) was a British actor.
Collier appeared on stage in Tony Richardson's production of Hamlet in 1969 at London's Roundhouse, and at the Lunt-Fontanne theater in New York City. Other repetory work includes appearances in Barrow-in-Furness and Liverpool, as well as the Royal Shakespeare Company. He also appeared in various television programmes including Rentaghost, Hi-de-Hi! and Howards' Way as well as in the Doctor Who serial The Time Monster.
Collier portrayed the villain Omega in the Fifth Doctor serial Arc of Infinity and later in the Big Finish Productions audio drama Omega. He played 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.
Collier's film credits included roles in Hamlet (1969), The Next Man (1976), A Nightingale Sang in Berkeley Square (1979) and Heritage Africa (1989).[10]
Collier died on 1 October 2008 of unspecified causes.

Shift Work
1986 · as Man without Insurance

Tangiers
1982 · as Police Sergeant

The Next Man
1976 · as Nicole's Contact

The Happy Valley
1987 · as Hotel Guest

A Nightingale Sang in Berkeley Square
1980 · as Sgt. George

The Ties That Bind Us
2008 · as Stuart Hyde (archive footage)

Thin Air
1988 · as Party Guest

Heritage Africa
1989 · as Patrick Snyper

Doctor Who: The Time Monster
1972 · as Stuart Hyde

The Lady's Maid's Bell
1983 · as Mr. Brympton

Doctor Who: Arc of Infinity
1983 · as Omega/The Renegade

The Doctors: Villains!
2018

Young Shoulders
1984 · as Gerald Cunningham

The Omega Factor
2007