ICCC is a four-character abbreviation with multiple meanings:
- Imperial College Canoe Club is a society of Imperial College Union.
- Imperial College Caving Club is a society of Imperial College Union.
- International C-Class Catamaran Championship, a match racing series for C-Class catamarans (under sail), held annually
- International Conference on Climate Change, an annual conference of global warming skeptics
- International Council of Christian Churches
- International Council of Community Churches
- International Conference on Coordination Chemistry
- International Christian Chamber of Commerce
- Iowa Central Community College
- International Conference on Computer Communications
- PKP Intercity