'''Geach''' is a surname. Notable people with the surname include:
*Carveth Geach (1928–2005), Chief Scout of the Boy Scouts of South Africa *David Geach (1923–2015), RAF bomb aimer *Peter Geach (1916–2013), British philosopher and professor *Portia Geach (1973–1959), Australian artist and feminist *Trevor Geach (1928–1996), South African cricketer
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