CLASS

CLASS can refer to:

• Canadian Land Surface Scheme, for use in large scale climate models
• Canadian Light Aircraft Sales and Service, a Canadian aircraft manufacturer
• Class (warez), a group from 1997 to 2004
• College of Liberal Arts and Social Sciences, an academic college at the University of Houston
• Cosmology Large Angular Scale Surveyor, an experiment to measure the polarization of the cosmic microwave background
• Custom Local Area Signaling Services, which describes telephony terms e.g. call waiting, caller ID