Farnham is a surname. Notable people with the surname include:
Brian Farnham, American journalistEliza Farnham (1815–1864), American novelist, feminist, abolitionist, and activist for prison reformJeremiah W. Farnham (?? - 1905), American merchant sailor and captainJohn Farnham (born 1949), Australian popsingerJoseph Farnham (1884–1931), American playwright and film screenwriterKeith Farnham (born 1947), American Democratic politician from IllinoisNicholas Farnham, Medieval Bishop of DurhamPaulding Farnham (1859–1927), American jewelry designerRoger Leslie Farnham (1864 - June 5, 1951), US banker, president of Haiti's national railroad, William Nelson Cromwell associate.Roswell Farnham (1827–1903), American Republican politicianRussell Farnham (1784–1832), American frontiersman and explorerSally James Farnham (1869–1943), American sculptorThomas J. Farnham (1804–1848), American explorer and authorWilliam Hudson Farnham (1869–1940), Canadian businessman and politician