Robert Hagan may refer to:

• Robert E. Hagan (1921–1999), American politician in Ohio
• Bob Hagan (Robert F. Hagan, born 1940), his son, American politician in Ohio
• Robert Hagan (artist) (born 1947), Australian television personality, author and artist
• Robert Hagan (naval officer) (1794–?), officer in the British Royal Navy

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