Sousaphone en Si♭
- longName: B♭ Sousaphone
- shortName: B♭ Sphn.
- description: B♭ Sousaphone
- musicXMLid: brass.sousaphone
- clef: F
- transposingClef: not set
- concertClef: not set
- barlineSpan: 1
- aPitchRange: 30-60
- pPitchRange: 24-74
- transposeDiatonic: -8
- transposeChromatic: -14