Elton 'Duffy' Plummer (31 July 1914 – 30 May 1988) was an Australian rules footballer who played with Essendon in the VFL during the 1930s and 1940s. Essendon recruited Plummer, a back pocket specialist, from Preston. At one stage he played 98 consecutive games and was a member of Essendon's 1942 premiership team. He also played in their losing Grand Finals of 1941 and 1943. Plummer kicked just one goal in his career, against Collingwood at Victoria Park. In 1944, his final season, he coached Essendon for seven games with regular coach Dick Reynolds suffering from appendicitis and they won four of them. He continued his coaching career at Brunswick in 1945.