Ophicléide Alto en Si♭
- longName: B♭ Bass Ophicleide
- shortName: B♭ B. Oph.
- description: B♭ Bass Ophicleide
- musicXMLid: brass.ophicleide
- clef: F
- transposingClef: not set
- concertClef: not set
- barlineSpan: 1
- aPitchRange: 33-62
- pPitchRange: 33-66
- transposeDiatonic: not set
- transposeChromatic: not set