Madelon Baans (born October 8, 1977 in Rotterdam, Zuid-Holland) is a former breaststroke swimmer from the Netherlands, who competed for her native country in three consecutive Summer Olympics, starting in 1996 in Atlanta, Georgia. She made her last international appearance at the European SC Championships 2005 in Trieste, Italy.
Baans is 49 time Dutch national champion (24 on long course), current Dutch national record holder at the 100m breaststroke in either the short course (25m) and long course (50m). During the 2004 European Championships in Madrid, she won the bronze medal as being part of the 4x100m medley, in the same year she reached the final at the 2004 Summer Olympics on the same discipline. She announced her retirement in November 2006.