
Oliver John MacGreevy (25 July 1928 – October 1981) was an Irish actor who appeared in many British films and television series from the mid 1950s until he retired in 1980, often as brutish, shaven-headed villains.
Among his roles he played Housemartin in The Ipcress File (1965) and made an appearance as both the Gardener and the Electrician in the first episode of The Prisoner TV series ("Arrival", 1967). He also appeared in an episode of Thriller (1975).
On stage, he appeared in Tom Murphy's A Whistle in the Dark at Joan Littlewood's Theatre Royal, Stratford East, in London, 1961.

Flash Gordon
1980 · as Klytus Observer No. 1

The Four Musketeers
1974 · as Headsman (uncredited)

The Ipcress File
1965 · as Housemartin

Modesty Blaise
1966 · as Tattooed Man

The Ruling Class
1972 · as Inmate

Tales from the Crypt
1972 · as Maniac

The Whisperers
1967 · as 2nd Redeemer

When Eight Bells Toll
1971 · as Quinn

The Leather Boys
1964 · as Merchant Seaman

The Frozen Dead
1966 · as Joseph the Butler

Great Catherine
1968 · as General Pskov

Salt & Pepper
1968 · as Rack

The Scamp
1957 · as Building Foreman

Time in Advance
1965 · as Chief Guard

The Nine Ages of Nakedness
1969 · as Hargreaves (segment "The Old Dark House")

A Wicked World
1964 · as Sir Humphrey

No. 1 of the Secret Service
1977 · as Simms

The Christmas Tree
1966