Marriott was born at Alpha Place, Yiewsley, Middlesex, on 14 September 1885, the son of George Matthew Marriott (1859–1940), who was then a commercial traveller, and his wife, Edith Rousby, née Coleman (1864–1946).
His parents were actors, and his father became a theatrical manager.
Moore Marriott made his stage debut at the age of five.
He had originally intended to train as an architect, but instead he became an actor in films.
Rather like Clive Dunn and Wilfrid Brambell later, he became typecast as playing old men when he was still relatively young.
He had a special set of artificial teeth which he would put in to play his 'old man' characters.
He had no teeth in real life and took four different sets of false teeth with him to achieve variety in his characters.

Although he made 131 film appearances from 1912, today he is probably best known as old "Harbottle" in a number of comedy films he made with Will Hay and Graham Moffatt, including Oh, Mr Porter! (
1937) and Ask a Policeman (1939), as well as Jerry the Mole in Convict 99 (1938), again with Hay and Moffatt.
During the filming of Hay's film Dandy Dick (1935), Marriott played an uncredited stableboy.
During the filming of Dandy Dick, Marriott said to Hay he thought he should be a straight man to him in his old-man character.
His first role as a straight man using this character was in Hay's film Windbag the Sailor (1936) along with Graham Moffatt.

Following the dissolution of the Will Hay/Graham Moffatt/Moore Marriott partnership, he continued to play his Harbottle-type character in films with the comedian Arthur Askey and the Crazy Gang, e.g. I Thank You (1941) and Back-Room Boy (1942).
His other film appearances included Millions Like Us (1943) and Green for Danger (1946).
Marriott was born at Alpha Place, Yiewsley, Middlesex, on 14 September 1885, the son of George Matthew Marriott (1859–1940), who was then a commercial traveller, and his wife, Edith Rousby, née Coleman (1864–1946). His parents were actors, and his father became a theatrical manager. Moore Marriott made his stage debut at the age of five. He had originally intended to train as an architect, but instead he became an actor in films. Rather like Clive Dunn and Wilfrid Brambell later, he became typecast as playing old men when he was still relatively young. He had a special set of artificial teeth which he would put in to play his 'old man' characters. He had no teeth in real life and took four different sets of false teeth with him to achieve variety in his characters.
Although he made 131 film appearances from 1912, today he is probably best known as old "Harbottle" in a number of comedy films he made with Will Hay and Graham Moffatt, including Oh, Mr Porter! (1937) and Ask a Policeman (1939), as well as Jerry the Mole in Convict 99 (1938), again with Hay and Moffatt. During the filming of Hay's film Dandy Dick (1935), Marriott played an uncredited stableboy. During the filming of Dandy Dick, Marriott said to Hay he thought he should be a straight man to him in his old-man character. His first role as a straight man using this character was in Hay's film Windbag the Sailor (1936) along with Graham Moffatt.
Following the dissolution of the Will Hay/Graham Moffatt/Moore Marriott partnership, he continued to play his Harbottle-type character in films with the comedian Arthur Askey and the Crazy Gang, e.g. I Thank You (1941) and Back-Room Boy (1942). His other film appearances included Millions Like Us (1943) and Green for Danger (1946).
Moore Marriott