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
• Operation Neptune (Germany), an attack in the Kuban in April 1943 by the Germans.
• Operation Neptune Spear, the operation by the United States to kill Osama Bin Laden

• Operation Neptune Spear, the killing of Osama Bin Laden

This disambiguation page lists articles associated with the title Operation Neptune.
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