Warstar may refer to:
- War hero or war star
- Warstar (comics), two aliens that serve as a member of the Shi'ar Imperial Guard (Marvel Comics)
- Universal Annihilation Army Warstar or "Warstar" (Japanese: 宇宙虐滅軍団ウォースター, Uchū Gyakumetsu Gundan Wōsutā), the antagonists from Tensou Sentai Goseiger
- The Warstar Empire, an organization appearing in the TV series Power Rangers Megaforce
- Warstar (GY73), a trawler built in 1914 by Cook, Welton & Gemmell