Others
- John Foster (composer and magistrate), composer of the tune set to "While Shepherds Watched Their Flocks by Night"
- John G. Foster (1823–1874), United States Army officer and Union general during the American Civil War
- John Foster (Australian sailor) (1935–2010), Commodore in the Australian Navy
- John Foster (priest) (1921–2000), Anglican dean of Guernsey
- Rev. John Foster, 18th century American clergyman
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