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 Holdings Berhad, a Malaysian car company.

Proton, province of a craton that is between 1.6 and 2.5 billion years old

Proton pill, a pharmaceutical taken by Roger Ramjet, the lead character in the US cartoon series by the same name. A single proton pill gives the popper the strength of twenty atom bombs for a period of twenty seconds

Proton, the name applied to a hydrogen ion, specifically ¹H which contains no neutrons.

Proton decay, radioactive decay in which the proton decays into lighter subatomic particles in particle physics

Proton pump inhibitor, group of drugs whose main action is pronounced and long-lasting reduction of gastric acid production

Proton pack, fictional piece of nuclear accelerative machinery created by the Ghostbusters

Proton-proton chain reaction, one of two fusion reactions by which stars convert hydrogen to helium

Proton, a make of rebreather breathing set made by Siebe Gorman

Proton emission, type of radioactive decay in which a proton is ejected from a nucleus

Proton Bank, an investment bank in Greece

Proton card, an electronic purse card introduced in Belgium by Banksys

Proton, Russian diver propulsion vehicle

Proton conductor, electrolyte in which movable hydrogen ions are the primary charge carriers

Proton satellite, Soviet artificial satellite

Proto may refer to: In linguistics: Proto-language, language that is the common ancestor of a set of related languages In fiction: Proto, one of the Nereids in Greek mythology Proto (Ghost in the Shell), fictional character in Masamune Shirow's Ghost in...

Proton Sponge, trademark assigned to Aldrich Chemical Company for 1,8-Bis(dimethylamino)naphthalene