Margareta Simu (born 2 May 1953 in Västerås) is a Swedish former racewalking athlete.

She competed three times at the IAAF World Race Walking Cup and was the winner in 1975 and bronze medallist in 1977.

She set a 10 km walk world record of 51:01 minutes in 1972, finally improving on Stina Lindberg's near-30-year-old time.

[2] Simu's time of 1:47:10 hours, set in 1973, was a 20 km walk world record for nearly four years.

[4] Simu was a three-time medallist at the Nordic Race Walking Championships, wither her best result being a gold medal in 1975.