Operation Neptune was the code name for the naval phase of the Allied Invasion of Normandy during World War II.
Operation Neptune may also refer to: Operation Neptune (espionage), a disinformation campaign by communist Czechoslovakia in 1964 Operation Neptune (Afghanistan) (2005) Operation Neptune (New Zealand), a commemoration of the 75th anniversary of the New Zealand Navy Operation Neptune (video game), a computer game
See also Operation Neptune Spear, the killing of Osama Bin Laden