John ("Jack") Arthur Gregory (22 June 1923 – 15 December 2003(2003-12-15) (aged 80)) was a British athlete who competed mainly in the 100 metres.

He competed for Great Britain in the 1948 Summer Olympics held in London, Great Britain in the 4 x 100 metre relay where he won the silver medal with his teammates Jack Archer, Alastair McCorquodale and Kenneth Jones.

He was reinstated in April 1948 and in January 1949 played his only game for England at rugby union in their defeat to Wales.

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