The Navy Occupation Service Medal is a decoration of the United States Navy which was issued to Navy, Marine Corps, and Coast Guard personnel who participated in the European and Asian occupation forces following the close of the Second World War. The decoration was also bestowed to personnel of who performed duty in West Berlin between 1945 and 1990.

The Navy Occupation Service Medal was presented as a medal with two service clasps, those being the "Europe" and "Asia" clasps. The following geographical duty areas, and time frames of eligibility, qualified a service member to receive the Navy Occupation Service Medal with Europe clasp.

Italy (November 8, 1945 to December 15, 1947)
Trieste (May 8, 1945 to October 25, 1954)
Germany (May 8, 1945 to May 5, 1955)
Austria (May 8, 1945 to October 25, 1955)
West Berlin (May 8, 1945 to October 3, 1990)

The Pacific Clasp was authorized for any service performed in the Asiatic-Pacific area between the dates of September 2, 1945 and April 27, 1952. This included service in Korea, however those service members who had received the Korean Service Medal could not be awarded both the Occupation Medal and Korean Service Medal for the same period of service.

The United States Army equivalent of the Navy Occupation Service Medal was the Army of Occupation Medal. Both medals appeared as identical ribbons but had different full sized medals and used different service clasps.