Countdown to Doom is a text adventure game written by Peter Killworth for the BBC Micro and published by Acornsoft in 1982.

An Acorn Electron version was released in 1984 but only as a ROM cartridge for the Plus 1 expansion.

It was published for the BBC Micro, Acorn Electron, ZX Spectrum, IBM PC compatibles, Amstrad CPC, Amstrad PCW, Atari ST, and RM Nimbus.

A RISC OS version was published in a compilation with Return to Doom and Philosopher's Quest.

The player's spaceship crash-lands on Doom's inhospitable surface and they emerge from the wreckage to realise that, unless they can locate the necessary spare parts, their ship will corrode away in a mere 400 time units.