Marjan Ridder (born Marjan Luesken 3 May 1953, Haarlem) is a retired female badminton player of the Netherlands.
Ridder won 17 Dutch titles. Internationally she was most successful in women's doubles, usually partnered with Joke van Beusekom, winning at the (first) European Youth Championships in 1969, the Denmark Open in 1972 and 1975, the Irish International in 1975, and the Dutch Open in 1977. She and Van Beusekom further earned bronze at the 1974, and 1978 European Championships, and silver at the (first) World Championships in 1977 in Malmö. With her partner Rob Ridder she won a bronze medal in the mixed doubles at the 1976 and 1978 European Badminton Championships
She is married to Rob Ridder, whose sister Marja Ridder, confusingly, was also a highly successful player. Marjan and Rob's son Koen Ridder now also playes badminton at top level.