Hattie Hayridge (born 17 December 1959) is a British comedian and actress, best known for the role of the female version of Holly in Red Dwarf during the third, fourth and fifth series.

Hayridge was a part of the late-1980s/early-'90s wave of alternative comedians on the British comedy circuit, appearing alongside Lee Evans, Jack Dee, Julian Clary, Paul Merton, amongst others.

In April 1988, she appeared on Friday Night Live hosted by Ben Elton, and was spotted by the producers of BBC's Red Dwarf for the episode "Parallel Universe" (Series II) to play Hilly, the female equivalent of the male computer, Holly (Norman Lovett).

As a guest on Robert Llewellyn's Carpool in March 2010, Hayridge said that the previous year she was asked to tell a joke at US Immigration to prove her occupation as a comedian, she told the official: "The reason I'm here is I want to go to Disney Land.

Hayridge's 1997 autobiography, Random Abstract Memory, tells the story "from her birth as a suspected appendicitis to her spontaneous leap into comedy".