The Allied Mastercomputer, better known as AM, is the main antagonist of Harlan Ellison's 1967 horror short story I Have No Mouth, and I Must Scream and its 1995 computer game adaptation of the same name.

He is a sentient supercomputer created during the backdrop of World War III who became responsible for the eradication of the human race in the present day. Instead of simply rendering humanity extinct, AM has dedicated decades to torturing the last five surviving humans left on the planet for eternity out of sheer misanthropic spite and hatred.

In the video game and radio drama adaptations, he was voiced by the the creator of the original story, the late Harlan Ellison.