The was one of the wartime armaments expansion plans of the Imperial Japanese Navy (IJN).
In September 1942, after being defeated in the Battle of Midway, the IJN drew up a new armaments expansion plan. This plan was combined by the 5th Naval Armaments Supplement Programme and the 6th Naval Armaments Supplement Programme to build the aircraft carriers rapidly. The main article was to build 20 aircraft carriers, and removed all battleships and heavy cruisers. Because of the need to protect convoys against Allied submarines some 72 destroyers were added to the programme and due to recent successes by Japanese submarines against Allied carriers some 96 large submarines were included.
They had approved 412 vessels, 1,150,000 tons. However, most of plans were not achieved. Until the end of the war only 60 vessels from this plan were completed.