A protostar is a very young star that is still gathering mass from its parent molecular cloud.
Protostar(s) may also refer to:
ProtoStar, a short-lived satellite company (2006–2009) Protostar (EP), a 2020 EP by JO1 Protostar: War on the Frontier, a 1993 science fiction video game Protostars (book), a 1971 science fiction anthology USS Protostar, a fictional Starfleet ship from the science fiction series Star Trek: Prodigy Kyle Fletcher, an Australian professional wrestler for All Elite Wrestling who uses "The Protostar" as a nickname