P2P, P-2-P, P2p and P-to-P may refer to
- Peer-to-peer (disambiguation)
- Peer-to-peer, a computing or networking distributed application architecture that partitions tasks or workloads among peers
- Social peer-to-peer processes, not restricted to technology, but covers every social process with a peer-to-peer dynamic, whether these peers are humans or computers
- Person-to-person (disambiguation)
- Point-to-point (disambiguation)
- Peak 2 Peak Gondola of Whistler Blackcomb, Canada
- Pay to play in gaming, politics, and music
- Purchase-to-pay, relating to the business process of purchasing
- Phenyl-2-propanone, a chemical substance used in organic chemistry; see Phenylacetone
- Pier to Pub, the largest open water swimming race in the world, held annually in Lorne, Australia
- People to People Student Ambassador Program, a cultural and educational travel program for students
- Permission to pollute, the subject of emissions trading
- Procure-to-pay, a business process in procurement