Gravitational Systems is an album by American jazz pianist Matthew Shipp featuring a duo with violinist Mat Maneri, which was recorded in 1998 and released on the Swiss hatOLOGY label. Shipp played previously with Maneri on the albums Critical Mass, The Flow of X and By the Law of Music, but this was their first duo performance. The recording includes a rendition of the English traditional song "Greensleeves" and a version of John Coltrane's classic "Naima".