Arleen Marilyn Day (March 7, 1949 – September 4, 2012) was a Canadian curler from Regina, Saskatchewan.
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.
Day was involved in a car accident in 1984, where she injured her back, and by 1986 she could not continue her curling career, so she turned to officiating the sport.