"軍艦行進曲" ("Warship March") - Tōkichi Setoguchi & Hiraku Toriyama, 1897

The Gunkan Kōshinkyoku ("軍艦行進曲", officially "March Man-Of-War") is a Japanese march composed in 1897 by Tōkichi Setoguchi. It was the official march of the Imperial Japanese Navy and is the official march of its successor, the Japan Maritime Self-Defence Force (JMSDF). In Japan, the march is also commonly referred to as the "Gunkan Māchi" (軍艦マーチ, Gunkan March).

The march, which sets to music lyrics by Hiraku Toriyama, was originally composed in B-flat major, but was transposed to F-major in the Taishō era in order to make it more manageable for men's voices. The third part of the song contains the lyrics of Umi Yukaba.

Three years after its composition, Setoguchi made an instrumental arrangement of the song for the Imperial Japanese Navy Band where he served as its bandleader. The march was subsequently adopted as the Imperial Japanese Navy's official march. The Warship March was performed in Europe during the Imperial Japanese Navy Band's tour of Europe in 1907.

When under the Nipponophone label Japan produced its first gramophone records in 1910, the Warship March was among the first records issued.

After Japan's defeat in the Pacific War, the Warship March was outlawed by the U.S. occupation forces. However, after the Treaty of San Francisco was signed, the march was revived by the Imperial Japanese Navy's successor, the Japan Maritime Self-Defence Force. The march's fame has endured in post-war Japan, making numerous appearances for pachinko parlors during that time.

In 1996, a monument commemorating the Warship March was erected at the Mikasa Park in Yokosuka, Kanagawa.