Shinjuku Gyoen National Garden (新宿御苑 Shinjuku Gyoen?) is a large park with an eminent garden in Shinjuku and Shibuya, Tokyo, Japan. About 31% of the park's area is in Shibuya Ward, with the remaining 69% in Shinjuku Ward. It was originally a residence of the Naitō family in the Edo period. Afterwards, it became a garden under the management of the Imperial Household Agency of Japan. It is now a park under the jurisdiction of the national Ministry of the Environment.
The shogun bequeathed this land to Lord Naitō (daimyo) of Tsuruga in the Edo period who completed a garden here in 1772. After the Meiji Restoration the house and its grounds were converted into an experimental agricultural centre. It then became a botanical garden before becoming an imperial garden in 1879. The current configuration of the garden was completed in 1906. Most of the garden was destroyed by air raids in 1945, during the later stages of World War II. The garden was rebuilt after the war.
The jurisdiction over the Imperial Palace Outer Garden and the Kyoto imperial garden was transferred to the Ministry of Health and Welfare (now part of the Ministry of Health, Labour and Welfare) in 1947.
On May 21, 1949 the garden became open to the public as "National Park Shinjuku Imperial Gardens". It came under the jurisdiction of the Ministry of the Environment in January 2001 with the official name "Shinjuku Gyoen National Garden".