KCO
KCO is an abbreviation for:
- Carbon monoxide transfer coefficient , actually K CO , a measure of the alveolar carbon monoxide transfer
- Kocaeli-Cengiz Topel Airport in Turkey (IATA code)
- Kaashidhoo Climate Observatory , a climatological observation station on Kaashidhoo Island (Kaafu) , Maldives
- Kings Chamber Orchestra , a chamber music orchestra founded in 1985 by Gerard Le Feuvre
- Klöckner & Co , an iron and steel trading company in Duisburg (share abbreviation), see also Klöckner-Werke
- Competence Center Oncology , a service of the statutory health insurance companies in Germany
- Koninklijk Concertgebouworkest , a symphony orchestra in Amsterdam
- a pseudonym of the Japanese singer Keiko Yamada