CP1 may refer to:

• CP1 (classification), a disability sport classification specific to cerebral palsy
• Am star, a class of chemically-peculiar stars
• Chicago Pile-1, the World's first artificial nuclear reactor
• Complex projective line (${\displaystyle \mathbb {CP} ^{1}}$), or Riemann sphere, in mathematics
• Vektor CP1, a South African pistol
• Warren CP-1, an experimental monoplane
• CP1: an EEG electrode site according to the 10-20 system
• Pasir Ris MRT station, MRT station code
• Cours Préparatoire 1^re année, first year of primary education in the French-like education system (e.g. Côte d'Ivoire)