Other
- John McCarthy (composer) (born 1961), canadian composer
- John McCarthy (journalist) (born 1956), British hostage and journalist
- John McCarthy (bishop) (1815–1893), Irish bishop
- John McCarthy, Jr., Oscar-nominated set decorator
- John Edward McCarthy (1911–1977), American radio personality
- John McCarthy (guitarist), guitarist
- John E. McCarthy (born 1930), Roman Catholic bishop of the Diocese of Austin
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