Trompette basse en Si♭
- longName: B♭ Bass Trumpet
- shortName: B♭ B. Tpt.
- description: B♭ Bass Trumpet
- musicXMLid: brass.trumpet.bass
- clef: not set
- transposingClef: G
- concertClef: G8vb
- barlineSpan: 1
- aPitchRange: 39-66
- pPitchRange: 39-69
- transposeDiatonic: -8
- transposeChromatic: -14