Marjan Ingrid Olyslager (born 8 March 1962) is a retired Dutch sprinter. She competed at the 1988 Summer Olympics in the 100 m hurdles and 4 × 100 m relay, reaching the semifinals. She won a silver medal at the 1988 European Indoor Championships in the 60 m hurdles. Nationally, she set multiple records and won 12 titles in hurdles events.