Monica Viola Westén-Rydén (born 15 March 1966, in Huddinge) is a retired Swedish athlete who competed primarily in the 400 metres hurdles. She represented her country at the 1992 Summer Olympics, as well as two World Championships, in 1991 and 1993. She won the bronze medal at the 1990 European Championships. Earlier in her career she was a combined events specialist. Her personal best in the event is 54.69 seconds set in Stockholm in 1990.