Cybergeddon (from tech. cyber-, lit. "computer"; Hebrew: Megiddo, extracted from Har Megiddo ("mountain of final battle")) refers to cataclysm resulting from a large-scale sabotage of all computerized networks, systems and activities. It combines cyberterrorism, cyberwarfare, cybercrime, and hacktivism into scenarios of wide-scale internet disruption or economic collapse. Economic or industrial infrastructure could be targeted, such as banks or industrial control systems. Since 2012, the number of Internet-based attacks and their complexity has increased.

The Defense Technical Information Center cited nuclear electromagnetic pulse attacks as a part of the military action that may bring about cybergeddon.