In medicine and pharmaceutics:

• Primary care physician, a doctor who acts as first point of consultation for patients
• Primary care paramedic
• Phencyclidine, a recreational drug known by a number of street names including angel dust, supergrass, killer weed, sherm, embalming fluid, and rocket fuel
• Pneumocystis pneumonia (PCP), (formerly known as Pneumocystis carinii pneumonia)
• Post-coital pill, a form of emergency contraception

In politics:

• Partido Comunista Paraguayo, Paraguayan Communist Party
• Partido Comunista del Peru, also known as Shining Path
• Partido Comunista Puertorriqueño, Puerto Rican Communist Party
• Partido Comunista Peruano, Peruvian Communist Party
• Partido Comunista Português, Portuguese Communist Party
• Partit Català Proletari, Proletarian Catalan Party

In science:

• Pentachlorophenol, timber preservative
• Post correspondence problem, an important problem in computability theory
• Priority ceiling protocol, a computer science concept
• Probabilistically checkable proof, a notion in the theory of computational complexity
• Put-call parity, in financial mathematics a relationship between the price of a call option and a put option

In technology:

• Pre-Charged Pneumatic, a type of air gun
• Primary Control Program, an earliest version of IBM OS/360 operating system

Miscellaneous:

• Faster/P.C.P., a single by Manic Street Preachers, from their 1994 album The Holy Bible
• Purple City Productions, a Harlem-based rap group