Doo or DOO may refer to:
The Doolittle Raid, also known as the Tokyo Raid, on Saturday, April 18, 1942, was an air raid by the United States of America on the Japanese capital Tokyo and other places on the island of Honshu during World War II, the first air strike to strike the Japanese Home Islands.
A door is a moving structure used to block off, and allow access to, an entrance to or within an enclosed space, such as a building or vehicle.
Doom 3 (stylized as DOOM3) is a science fiction first-person shooter video game developed by id Software and published by Activision.
Doom metal is an extreme style of heavy metal music that typically uses slower tempos, low-tuned guitars and a much "thicker" or "heavier" sound than other metal genres.
Doom is a first-person shooter video game developed by id Software and published by Bethesda Softworks.
Dookie is the third studio album by American punk rock band Green Day, released on February 1, 1994, through Reprise Records.
The Doomsday argument (DA) is a probabilistic argument that claims to predict the number of future members of the human species given an estimate of the total number of humans born so far.