Arleen Marilyn Day (March 7, 1949-September 4, 2012) was a Canadian curler from Regina, Saskatchewan. Day was born in Nokomis, Saskatchewan as Arleen Fitzsimmons and grew up in Govan, Saskatchewan. She would later move to Regina to attend business college. She began curling at age 13. In 1982, she skipped her team of Shirley McKendry, Velva Squire and Dorthy Hepper to a provincial championship. At the 1982 Scott Tournament of Hearts, Day and her Saskatchewan rink finished the round robin in a 5-way tie for first place with a 7-3 record. The team beat Alberta's Cathy Shaw in a tie breaker match, but would lose in the semi-final to Nova Scotia's Colleen Jones.