| Medal record | ||
|---|---|---|
| Men's swimming | ||
| Competitor for England | ||
| British Empire Games | ||
| Gold | 1938 Sydney | 4×220 yd freestyle |
| Silver | 1934 London | 4×200 yd freestyle |
| Bronze | 1934 London | 3×110 yd medley |
Mostyn Yanto Ffrench-Williams (12 October 1914 – 11 November 1963) was an English freestyle and backstroke swimmer who competed for Great Britain in the 1932 Summer Olympics and in the 1936 Summer Olympics.
He was born in London.
In 1932 he finished fifth with the British team in the 4×200 metre freestyle relay event. In the 100 metre freestyle competition he was eliminated in the first round.
Four years later he was a member of the British team which finished sixth with the British team in the 4×200 metre freestyle relay contest at the 1936 Games. He also swam in the 100 metre freestyle event but was eliminated in the first round again.
At the 1934 Empire Games he was a member of the English team which won the silver medal in the 4×200 yards freestyle competition. In the 3×110 yards medley contest he won a bronze medal with the English team. Four years later at the Empire Games in Sydney he was part of the English team which won the gold medal in the 4×220 yards freestyle event. In Sydney he also participated in the backstroke competition.