Martha Stager was an American open water swimmer of Portland, Oregon who swam over 19 hours in the Wrigley Ocean Marathon Swim on 15-16 January 1927, a professional channel race sponsored by William Wrigley, Jr. who owned the Santa Catalina Island Company in order to promote Catalina Island.
The swim offered a cash prize of US$25,000 to the winner between Catalina Island and Point Vicente on the Southern California mainland.
The Wrigley Ocean Marathon Swim attracted 102 competitors, including a 17-year-old Canadian George Young who was the only finisher and declared winner with a time of 15 hours 44 minutes 30 seconds.
Margaret Hauser of Long Beach, California and Stager were awarded prize money of US$2,500, despite not completing the race.
The authoritative history of Catalina Channel swimming was published by International Swimming Hall of Fame Honour Swimmer Penny Dean.