J
- Jack Mason, English cricketer
- Jackie Mason, American comedian
- James Mason (disambiguation), several people including:
- James Mason, British actor
- James Mason (1849–1905), chess player
- James Mason, American Neo-Nazi
- James Murray Mason, American Confederate politician
- James O. Mason, acting US Surgeon General
- James Mason, Australian field hockey player
- James Wood-Mason, Scottish zoologist
- Jeanine Mason, winner of So You Think You Can Dance (season 5)
- John Mason (disambiguation), several people including:
- Sir John Mason (1503-1566), British diplomat and spy
- John Mason (1586-1635), founder of the Province of New Hampshire.
- John Mason (c.1600-1672), commander of the Connecticut forces in the Pequot War in 1637
- John Mason (businessman), an early 19th century merchant and banker, founder of Chemical Bank and the New York and Harlem Railroad
- John Sanford Mason, Union general in the American Civil War
- John Thomson Mason, U.S. Congressman from Maryland
- John Mason, Australian politician
- John Y. Mason (1799–1859), American politician and diplomat
- Jonathan Mason (disambiguation), several people
- Joseph Mason, American settler
- Sir Josiah Mason (1795–1881), pen manufacturer
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