Portia Stranston Geach (24 December 1873, Melbourne – 5 October 1959, Sydney) was an Australian artist and feminist. She was a founder and a president of the New South Wales Housewives' Association, as well as a president of the Federal Association of Australian Housewives. The Portia Geach Memorial Award, established by a legacy from Geach's sister, is Australia's most significant prize for Australian female portrait artists.