Japanese nuclear weapons program

Empire of Japan
Nuclear program start date	1940 (ended in 1945)
First nuclear weapon test	None
First thermonuclear weapon test	None
Last nuclear test	None
Largest yield test	None
Total tests	None
Peak stockpile	None
Current stockpile	None
Current strategic arsenal	None
Cumulative strategic arsenal in megatonnage	None
Maximum missile range	None

Weapons of mass destruction
By type
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Proliferation
Chemical Nuclear Missiles
Treaties
List of treaties (treaty parties)
Category
v t e

During World War II, Japan had several programs exploring the use of nuclear fission for military technology, including nuclear reactors and nuclear weapons. Like the similar wartime programs in Nazi Germany, it was relatively small, suffered from an array of problems brought on by lack of resources and wartime disarray, and was ultimately unable to progress beyond the laboratory stage during the war.

Today, Japan has no known nuclear weapons programs. It is a signatory in good standing of the Nuclear Non-Proliferation Treaty and has enacted domestic legal prohibitions against producing nuclear weapons. However, it is unique among non-nuclear weapons states in that it possesses a full nuclear fuel cycle, as part of its civilian nuclear energy industry, and advanced developments in the industries necessary to make nuclear weapons. As a result, it is often cited as a primary example of a latent or threshold nuclear state, capable of developing weapons in a very short timespan should its government decide to do so.^[1]