Piano Jazz, or Jazz Piano, is a collective term for the techniques pianists use when playing jazz. The piano has been an integral part of the jazz idiom since its inception, in both solo and ensemble settings. Its role is multifaceted due largely to the instrument's combined melodic and harmonic capabilities. For this reason it is an important tool of jazz musicians and composers for teaching and learning jazz theory and set arrangement, regardless of their main instrument. (By extension the phrase 'jazz piano' can refer to similar techniques on any keyboard instrument.)

Along with the guitar, vibraphone, and other keyboard instruments, the piano is one of the instruments in a jazz combo that can play both single notes and chords rather than only single notes as does the saxophone or trumpet.