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:

In astronomy:

• 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