Marijke Schaar (born 12 November 1944), also known under her maiden name Marijke Jansen, is a former Dutch female tennis player who was active during the 1960s and 1970s. She reached a highest singles ranking of world number 21 in 1971. She had her most successful year in 1971 when she reached the semifinal of the singles event at the French Open, losing to eventual champion Evonne Goolagong, and the fourth round of the Wimbledon Championships. In March 1969 she won the singles title at the Cannes Championships, defeating compatriot Betty Stöve in the final in three sets.