CT-1
CT-1, CT1 and CT 1 can refer to:
- ČT1, a television channel in the Czech Republic
 - CT1, a cordless telephone standard
 - Cosina CT-1, a 35mm film SLR camera
 - Connecticut's 1st congressional district
 - Connecticut Route 1
 - Cardiotrophin 1
 - Core Tier 1 Capital