Robert O'Neill may refer to:

• Robert O'Neill (Navy SEAL), Navy SEAL who claims to have fatally shot Osama bin Laden
• Robert J. O'Neill (born 1936), Australian military historian
• Robert Torrens O'Neill (1845–1910), Irish Unionist politician
• Robert O'Neill (footballer) (1883–1961), Australian rules footballer
• Robert E. O'Neill, American attorney

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