Margo F. Jonker is an American softball coach and the current head coach of the Central Michigan Chippewas. During her 31 years as head coach, the Chippewas have gone to the NCAA tournament 13 times and have 11 Mid-American Conference titles. Jonker was formerly an assistant softball coach at Grand Valley State University and head coach at West Ottawa High School. CMU's Margo Jonker stadium is named after her. At the 2000 Olympics she served as an assistant coach on the United States Olympic softball team that captured the gold medal in Sydney, Australia. She is a Holland, Michigan native and attended and played softball for the Grand Valley State Lakers.