Fulton Mackay (August 12, 1922 - June 6, 1987) was a Scottish actor and is still fondly remembered for his role as Mr Mackay in Porridge which ran between 1974 and 1977.

Mackay was born in Paisley, Scotland. He trained as a quantity surveyor and served with the Black Watch during the Second World War. After training as an actor at RADA he appeared in several films and television programmes, but was best remembered for his role as the warder, Mr Mackay, in the British sitcom, Porridge. He also played a leading role in the hit film, Local Hero (1983) and was the original lighthouse-keeper in the British version of the children's series, Fraggle Rock.

On television, before coming to prominence in Porridge, he had a regular role as DI Inman in the police series Special Branch between 1969-71. He also played roles in series such as Z Cars, was misguided scientist Doctor Quinn in the 1970 Doctor Who story Doctor Who and the Silurians (and was also in the running to play the Doctor himself when Jon Pertwee gave up the role) and played a regular officer running a training course in the Dad's Army episode, "We Know Our Onions" and a doctor in "The Miser's Hoard"

Mackay died in 1987 from cancer of the stomach.

Mackay was seriously considered for the role of the fourth Doctor in the BBC series "Doctor Who" (1963), after the departure of Jon Pertwee.

There is a flower in Hyde Park named after him.