John Mulcahy may refer to:
- John Mulcahy (businessman), former Australian CEO of various listed companies
- John Mulcahy (journalist), Irish founder of The Phoenix magazine.
- John Mulcahy (rower), American gold-medal Olympic rower.
- John Mulcahy (industrialist), 19th century Irish woollen manufacturer.
This disambiguation page lists articles about people with the same name.
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