The Sinfonieorchester Basel is a Swiss ensemble. Its modern name and organization are derived from the merging of two orchestras, the Basler Sinfonie-Orchester and the Radio Sinfonieorchester Basel in 1997.
Its concert hall is the Music Room of the Stadtcasino, though it also performs at the Theater Basel.The orchestra's chief conductor from 2009 to 2016 was Dennis Russell Davies, and its principal guest conductor as of the 2016-2017 season was Michel Nesterowicz. Ivor Bolton, Davies' successor, was named in 2015. Sinfonieorchester Basel has recorded for Ars Musici, Novalis, CPO, Orange Mountain Music, and its own label.