Vex may refer to: confuse or annoy In technology: VEX prefix, a microprocessor opcode prefix and coding scheme for the x86 instruction set architecture Vex Robotics Design System, a robotic construction kit FIRST Vex Challenge, a robotics competition One of Houdini's scripting languages Venus Express, a European Space Agency space mission to the planet Venus A suborbital test rocket (Tronador (rocket) in development by Argentina In music: Vex (album), by Steel Pulse Z.Vex Fuzz Factory, a brand of fuzz box used for musical effects Other: Vex, Switzerland, a municipality Ulorin Vex, English model Vex, a brachiopod genus Virgin Express, a European airline, now merged into Brussels Airlines Voltayre's Encyclopedia Xenobiologica, a fictional guide to the Babylon 5 universe Vex, one of the 25 unlockable characters in Maxis's Action RPG Darkspore Vex, in the Canadian television series, Lost Girl