Gerald Sim (born 4 February 1925) is an English actor who is perhaps best known for playing the Rector in To the Manor Born.

The brother of actress Sheila Sim and brother-in-law of actor/director Richard Attenborough, Sim has nearly 100 film and television appearances. Film roles include The L-Shaped Room (1962), Séance on a Wet Afternoon (1964), King Rat (1965), Oh! What a Lovely War (1969), Ryan's Daughter (1970), Dr. Jekyll and Sister Hyde (1971), Frenzy (1972), Young Winston (1972), A Bridge Too Far (1977), Gandhi (1982), as Dr George Bagster Phillips in Jack the Ripper (1988), Chaplin (1992), and Patriot Games (1992). Coincidentally playing a vicar, he appeared in one episode of Keeping up Appearances before Jeremy Gittins took on the role of the vicar on a more permanent basis. He is retired from acting, although he appeared in the 2007 25th Anniversary special episode of To the Manor Born.

Brother of actress Sheila Sim

Brother-in-law of Richard Attenborough

Uncle of director Michael Attenborough (I) and actress Charlotte Attenborough