Robert McNamara (1916–2009) was an American business executive and Secretary of Defense.

Robert or Bob McNamara may also refer to:

• Bob McNamara (baseball) (1916–2011), American infielder and shortstop
• Bob McNamara (Canadian football) (1931–2014), American running back and defensive back
• Bob McNamara (sports executive) (born 1961), Canadian general manager of Grand Rapids Griffins
• Robert H. McNamara (born 1965), American golfer, winner of 1986 and 1989 Kentucky Open, a/k/a Rob McNamara
• Robert McNamara (figure skater) (born 1987), Australian winner of national title in 2009–10 season
• Robbie McNamara (born 1989), Irish jockey, winner of 2014 Champion Bumper

• Robert Craig McNamara (born 1950), American farmer and activist, a/k/a Craig McNamara; son of Robert McNamara

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