One for One is a compilation album of previously unissued studio tracks by American jazz pianist Andrew Hill, featuring performances recorded in 1965, 1969 and 1970 but not released on the Blue Note label until 1975 as a double LP. It features eleven of Hill's compositions: tracks 7-11 would later be released on The Complete Blue Note Andrew Hill Sessions (1963-66) in 1995 (and in 2006 as Pax); tracks 1-6 would be featured on Mosaic Select 16: Andrew Hill only in 2005.