John O'Donovan

• John O'Donovan (scholar), Irish language scholar and place-name expert
• John O'Donovan (politician), Irish TD and Senator
• John O'Donovan (police commissioner), New Zealand police commissioner
• John O'Donovan (Gaelic footballer), Irish footballer
• John Francis O'Donovan, Irish chess master
• John O'Donovan, guitarist with The Adolescents punk band