- Calmus Ensemble
- Camerata Hungarica
- Camerata Nova
- Camerata Trajectina
- Cantar alla Viola
- Cantemus Choral Institute
- Cantica Symphonia
- Canticum Novum
- Cantillation
- Cantus Thuringia
- Capella Alamire
- Capella de la Torre
- Capella Prolationum
- Capilla Flamenca
- Cappella Amsterdam
- Cappella de'Turchini
- Cappella Mariana
- Cappella Musicale di Santa Barbara
- Cappella Musicale Monteberico Vicenza
- Cappella Pratensis
- Cappella Romana
- Capriccio Stravagante Renaissance Orchestra
- Catherine Bott
- Catherine King
- Catherine King
- Chanterie de la Renaissance française
- Chanticleer
- Charles Daniels
- Choeur de Chambre de Namur
- Choir of Clare College, Cambridge
- Choir of Girton College, Cambridge
- Choir of Gonville and Caius College, Cambridge
- Choir of King's College, Cambridge
- Choir of St Mary’s Cathedral, Edinburgh
- Choir of St. John's College, Cambridge
- Choir of Winchester Cathedral
- Chor Madrigal de Barcelona
- Christian Tetzlaff
- Christiane Van Acker
- Christophe Rousset
- Christopher Hogwood
- Christopher Jackson
- Cinquecento
- City Waites
- Claire Antonini
- Claire van Kampen
- Claudio Astronio
- Clematis
- Clemencic Consort
- Clerks of the Choir of New College Oxford
- Colin Tilney
- Collegium Aureum
- Collegium Musicum of London Chamber Choir
- Collegium Musicum of Paris
- Collegium Vocale
- Collegium Vocale Gent
- Concentus Monodicus Schola Gregoriana
- Concerto Caledonia
- Concerto delle Dame di Ferrara
- Concerto Italiano
- Consort Of Musicke
- Corale Universitaria di Torino
- Corina Marti
- Coro dell'Accademia corale di Lecco
- Coro della Cappella di Treviso
- Coro Polifonico Santo Spirito
- Coro RTVE
- Crawford Young
- Cupertinos
- Currende