John Costas may refer to:
- John Costas (Greek revolutionary) (1868–1932), Greek revolutionary and volunteer during Second Boer War.
- John P. Costas (engineer) (1923–2008), American engineer, invented the Costas loop and Costas arrays
- John P. Costas (business) (born 1957), American businessman, former head of UBS Investment Bank and Dillon Read Capital Management
This disambiguation page lists articles about people with the same name.
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