波島砲台は神奈川県横須賀市にあった砲台。 横須賀軍港防御のため、湾口東端の波島崎に築かれた。明治23年竣工、24糎加農砲2門を備えた。大正4年除籍。 除籍後、海軍の信号所が築かれた。戦後は米軍に接収され、現在は米海軍横須賀基地内に位置する。 砲側庫と思われるレンガ造の掩蔽部が1基、防空壕や貯水池が残っている。
Magojima Battery was a battery in Yokosuka City, Kanagawa Prefecture. To protect the Yokosuka military port, it was built at Wajimazaki at the east end of the bay mouth. It was completed in 1823 and equipped with two 24-year agricultural cannon. Exclusion for 4 years in Taisho. After removal, the Navy's signal station was built. It was taken over by the US Army after the war, and now it is located in the US Navy Yokosuka Base. There is one brick-made covering part that seems to be a gun side warehouse, a shelter and a reservoir are left.