ICOS (disambiguation)

ICOS was the largest biotechnology company in the U.S. state of Washington.

ICOS may also refer to:

• The International Code of Maritime Signals
• Integrated Carbon Observation System
• The International Council on Security and Development (ICOS)
• International Council of Onomastic Sciences
• The Irish Co-Operative Organisation Society
• CD278 or ICOS, a CD28-superfamily costimulatory molecule
• Integrated Cavity Output Spectroscopy, a type of laser absorption spectrometry
• .ico Files