The Fleet Science Center is a science museum and planetarium in Balboa Park, located in San Diego, California. It is at the east end of the El Prado Drive walkway, next to the Bea Evenson Fountain and plaza in central Balboa Park.

A science museum is a museum devoted primarily to science. Older science museums tended to concentrate on static displays of objects related to natural history, paleontology, geology, industry and industrial machinery, etc. Modern trends in museology have broadened the range of subject matter and introduced many interactive exhibits. Modern science museums, increasingly referred to as 'science centres' or 'discovery centres', also feature technology.