Proton (disambiguation)
A proton is a subatomic particle with a positive fundamental electric charge of 1.6 × 10-19 coulomb and a mass of 938 MeV.
Proton may also refer to:
- Proton rocket, Russian unmanned space vehicle design
- Proton satellite, Soviet artificial satellite
- Proton-proton chain reaction, one of two fusion reactions by which stars convert hydrogen to helium
