Marilyn May Mason (June 29, 1925 – April 4, 2019) was an American concert organist, recording artist and professor. She joined the staff of the University of Michigan in Ann Arbor in 1947. She became chair of the organ department in 1962, and was named a professor in 1965. She retired in 2014, making her the longest serving University of Michigan staff member at 67 years. She was born in Alva, Oklahoma.