Jast

Jast may refer to:
 * Joint Advanced Strike Technology (JAST) project was merged with the Common Affordable Lightweight Fighter (CALF) project to make the Joint Strike Fighter program.
 * JAST USA
 * Jast, a member of the Cult of Skaro in Doctor Who.
 * JAST, a Japanese game company known for Tenshitachi no gogo.
 * JAST, Journal of Adhesion Science and Technology.