|Born||15 September 1905|
|Died||2 January 1983|
|First appearance||The Armoured Might of Lance Corporal Jones|
|Last appearance||Knights of Madness|
Born in 1905 in Hendon in Middlesex, she was the daughter of Henry James Adams (born 1875), a theatre ticket agent, and Fanny Maria (née Dunnett, 1875-1961). In 1931 she married Charles Harry Mercer; they remained married until her death.
She often played stern older women in situation comedies, including On the Buses, Billy Liar and Whatever Happened to the Likely Lads?. She also appeared in The Ronnie Barker Yearbook (1971).
Olive Mercer died in Hillingdon in Middlesex in 1983.