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- Michael Eugene Kelly (born 1949), automotive manufacturing entrepreneur and investment holding businessman
- Michael Kelly, current headmaster of The John Henry Newman School, Stevenage
- Michael Kelly (American actor) (born 1969), American actor featured in Dawn of the Dead (2004)
- Michael Kelly (bishop) (1850–1940), fourth Roman Catholic Archbishop of Sydney
- Michael Kelly (editor) (1957–2003), American writer and editor
- Michael Kelly (Lord Provost) (born 1940), former Lord Provost of the City of Glasgow and businessman
- Michael Kelly (physicist) (born 1949), New Zealand-British physicist
- Michael Kelly (tenor) (1762–1826), Irish actor, singer and composer
- Michael Kelly Guitars, American guitar, bass, and mandolin manufacturer
- Michael P. Kelly (born 1954), American architect and urban planner
- Mick Kelly (writer), writer of Simpsons episode Little Orphan Millie
- Mike Kelly (journalist), American writer
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