Bij Holland Harmony zijn de volgende koren aangesloten:
- Amstel River Singers (v)
- Between Two Rivers (v)
- Bewitched (v)
- DBM a Capella (m)
- Duketown Barbershop Singers (m)
- Dutch Pride (v)
- Lake District Sound (m)
- Mainport Barbershop Singers (m)
- Miracle Sound (v)
- New Achord (v)
- Sea Sound Singers (v)
- Sound Waves (v)
- Southern Comfort Barber Gals (v)
- Southern Comfort Barber Mates (m)
- Swinging Woodnotes (v)
- The Gaggling Ganders Gang (m)
- The Hugo Barber Ladies (v)
- The New Harvest Singers (v)
- The New Land Singers (v)
- The Skyline Sisters (v)
- T-SiNG! (m)
- Valley Voices Vocal Group (v)
- Vocal Group Keychange (v)
- Vocal Group Route Sixteen (v)