Yamanashi Science Museum (山梨県立科学館, Yamanashi-kenritsu kagaku-kan) is a science museum located in Kōfu, Yamanashi Prefecture, Japan. The museum specializes in astronomy and technology.

The museum was originally located at Kofu Castle but was moved to its present location in 1998 when reconstruction of the Kofu Castle began.

The museum includes a planetarium, astronomical observatory dome, exhibition room, experience study room, and a library. The museum is a 25 minute walk from the north exit of Kōfu Station.

• Yamanashi Science Museum (in Japanese)

35°40′10″N 138°34′49″E / 35.66944°N 138.58028°E / 35.66944; 138.58028