Hoorn in B♭ basso
- longName: Horn in B♭ basso
- shortName: B♭ ba Hn.
- description: Low B♭ Horn
- musicXMLid: brass.natural-horn
- clef: F
- transposingClef: not set
- concertClef: not set
- barlineSpan: 1
- aPitchRange: 32-65
- pPitchRange: 28-70
- transposeDiatonic: -1
- transposeChromatic: -2