Susan Mary Platt (born 4 October 1940) is a British former track and field athlete who competed for England and Great Britain in the javelin throw.

[1] Platt emerged at national level in 1959 with a win in the javelin at the Women's AAA Championships.

[4] Platt made three appearances at the Summer Olympics – 1960, 1964 and 1968 – being Great Britain's leading female javelin thrower in the 1960s.

Her first outing in 1958 saw her finish in fourth place, one spot behind England teammate Averil Williams, but over ten metres behind winner Anna Pazera, who set a world record.

With a throw of 50.26 m (164 ft 10+1⁄2 in), Platt topped the podium at the 1962 games, where Pazera fell to third in the rankings and Rosemary Morgan made it a 1–2 for England.