Joseph Thewlis (born 1943), is a male former diver who competed for England and South Africa.

Thewlis was a National junior champion before representing England in the 3 metres springboard, at the 1970 British Commonwealth Games in Edinburgh, Scotland.

[1][2][3] In 1972 he emigrated to South Africa, where he represented that country in 1975, competing against Rhodesia.

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