Peter Farmer (3 November 1936 – 1 January 2017) was a British set designer, theatre artist, and book illustrator.
Born in Luton on 3 November 1936, the son of a hat factory owner, he studied at an art college in Luton and made his professional debut with his designs for Jack Carter's Agrionia for London Dance Theatre.Starting with a production of Giselle for the Stuttgart Ballet in 1966, Farmer worked extensively in ballet, both with the Royal Ballet and Birmingham Royal Ballet, as well as other major international ballet companies. For the Royal Ballet he designed productions of Giselle (1971), The Sleeping Beauty (1973), Robert North's The Troy Game (1980) and Kenneth MacMillan's Winter Dreams (1991). For Frederick Ashton's centenary he was invited to supplement the original designs for Sylvia, and in 2006 he also supplemented Oliver Messel's legendary 1946 designs for The Sleeping Beauty. After this came Homage to The Queen, a showpiece ballet to celebrate Queen Elizabeth II's 80th birthday. His final credit with The Royal Ballet came the following year, with the company's first production of George Balanchine's Theme and Variations.