Robert, Rob, Bob, or Bobby Duffy may refer to:
- Robert Duffy (politician) (born 1954), Lieutenant Governor of New York
- Robert Duffy (footballer) (born 1982), Welsh footballer
- Robert Duffy (American football) (1903–1974), Dickinson College football coach (1927–28)
- Bob Duffy (basketball, born 1922) (1922–1978), American basketball player in the BAA
- Bob Duffy (basketball, born 1940), American basketball player in the NBA
- Bobby Duffy (died 1992), Irish soccer player
- Robert Duffy (businessman) (born 1954), American businessman
- Robert Duffy (programmer) (born 1964), American video game programmer
This disambiguation page lists articles about people with the same name.
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