Kumamoto City Museum, Public museum in Kumamoto Castle Park, Japan

Kumamoto City Museum is a multi-floor facility in Kumamoto Castle Park, housing exhibitions on regional history and natural sciences. A planetarium in the basement offers additional programs about the sky and space.

The museum first opened on 4 February 1952, with an initial hall in the Uto turret of Kumamoto Castle and a second hall on the site of the former 6th Division headquarters. It moved into the former city industrial promotion building in 1961 and closed there in December 1977. The present main building opened on 1 April 1978 in the Sannomaru area of the castle grounds, designed by Kisho Kurokawa's architecture and urban design office. After closing for a major renewal in July 2015, it reopened on 1 December 2018.

The permanent exhibition on the first floor traces Kumamoto's history from the Palaeolithic period through the Satsuma Rebellion, with about 4,100 objects shown across the renewed building under the theme "Kumamoto's memories for the future". The second floor covers the animals and plants living in Kumamoto, and a planetarium occupies the basement.

The museum sits inside the castle park and is easy to reach on foot from downtown, as the park paths are well marked. Going in the morning generally means fewer people in the exhibition rooms.

The 1978 main building was designed by Kisho Kurokawa's architectural office. The museum's renewal, themed "Kumamoto's memories for the future," displays about 4,100 objects from ancient times to the present, with palaeolithic and Satsuma Rebellion material on the first floor and Kumamoto's flora and fauna on the second.