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
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