Reactor

Reactor may refer to:

Science

 * Bioreactor, a device which controls a biologically active environment.
 * Chemical reactor, a device for containing and controlling a chemical reaction
 * Fusion reactor, a device for containing and controlling a fusion power reaction
 * An inductor (possessing reactance) in an electrical power grid
 * A current limiting reactor is used to limit starting current of motors and to protect variable frequency drives
 * Nuclear reactor, a device for containing and controlling a nuclear reaction
 * Reactor (software), a physics simulation engine
 * The reactor design pattern, a design pattern used in concurrent programming

Entertainment

 * Reactor (magazine), an online science fiction and fantasy magazine, formerly known as Tor.com
 * Re·ac·tor, a 1981 album by Neil Young and Crazy Horse
 * Reactor (arcade game), an arcade game created by Gottlieb
 * The Reactor (show rod), a show car built by Gene Winfield
 * Reactor, an alternate title for Deadlock, a 2021 American action thriller film starring Bruce Willis
 * Reactor, an alternative title for the 1978 Italian film War of the Robots directed by Alfonso Brescia
 * Reactor, Inc., a defunct interactive entertainment company founded by Mike Saenz
 * Reactor, a comedy series hosted by David Huntsberger on Syfy