Maaike Koutstaal (born 20 June 1975) is a former professional tennis player from the Netherlands.
Born in Rotterdam, Koutstaal competed on the ITF junior circuit in the early 1990s and most notably was runner-up in the girls' doubles at the 1993 French Open.
As a professional player she was most successful in the doubles format, with a best ranking of 86 in the world.
Her best performance on the WTA Tour came at the 1995 Indonesia Open, where she qualified for the singles main draw and was a quarterfinalist in the doubles, partnering Dominique Monami.
In 1995, she competed in the main draw of the women's doubles at all four Grand Slam tournaments, which included a round of 16 appearance at the Wimbledon Championships.