King Charles Singers
- Chamber choir of ex-choral scholars based in Tunbridge Wells, UK. Services, concerts, and rehearsals.
- http://www.kingcharlessingers.org.uk/

Kettwiger Bach-Ensemble
- Established since 1984 at the catholic parishchurch St. Peter in Essen-Kettwig, NRW, Germany. Site in German and English.
- http://www.kettwig.de/vereine/kettwiger-vokalmusik/e_index.html

Korinnya Ukrainian Folk Choir
- The repertoire consists of traditional Ukrainian folk music, both sung a cappella and with traditional Ukrainian instruments. Korinnya is under the musical direction of Cathy Lebedovich.
- http://www.korinnya.com/

Kampin Laulu
- Chamber choir from Helsinki, Finland. Site in Finnish and English.
- http://kampinlaulu.fi/

Kölner Kantorei
- Mainly a cappella choral works of the nineteenth and twentieth centuries. Köln, Nordrhein-Westfalen, Germany. Site in German and English.
- http://www.koelner-kantorei.de/

Kent Chamber Choir
- English choir that enjoys a high reputation for its performances of a wide range of sacred and secular music.
- http://www.kentchamberchoir.org.uk/