Delta Green: Countdown is a 1999 role-playing game supplement published by Pagan Publishing for Call of Cthulhu.
Contents Delta Green: Countdown is a supplement for the Delta Green setting about international agencies, cults and conspiracies.
Publication history Shannon Appelcline explained that with the Delta Green setting, "the best-received book was a massive supplement three years in the making, Delta Green: Countdown (1999), in which Detwiller, Glancy, and Tynes massively expanded the setting". Blair Reynolds pained the cover, and this was his final published work for role-playing games for about a decade. Delta Green: Countdown had difficulty selling in Germany due to the country's censorship laws and the Nazi imagery present on the cover art.
In 2026, Countdown was re-released as Delta Green: The Millenium, as part of the Delta Green: The Conspiracy Kickstarter's stretch goals to update classic sourcebooks for the standalone Delta Green role-playing game.
Reception Delta Green: Countdown won the Origins Awards for Best Roleplaying Supplement of 1999.
Reviews Pyramid Backstab #19 Casus Belli #122
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