Keith Marsh (1926 – 28 January 2013) was an English actor who appeared in numerous television productions over a 50-year period.

Born in Blackpool, Lancashire, he is perhaps best known for playing Jacko in the Thames Television sitcom Love Thy Neighbour (1972–76), who had the catchphrase "I'll have half!"

Other TV appearances include Coronation Street, in which he appeared as a foreman (1961), George Chippendale (1966), James Dawson (1972), George Marsden (1980), Harry Ashton (1988) and Uncle Mervin (1999).

[1] He also appeared in George and the Dragon, Edna, the Inebriate Woman, Last of the Summer Wine, ‘’Special Branch’' (1974, series4,ep12), and The Bill.

In 1985 Marsh appeared in The Beiderbecke Affair as "Harry" (the man with the dog called Jason).