Unguided bomb
（重定向自Iron bomb）
![An unguided 227 kg (500lb) Mark 82 bomb.](/Images/godic/202501/21/Mark82Bomb2049.JPEG")
![A F-111 dropping Mark 82 bombs with ballute type retardation systems (Mk82AIR / BSU49B)](/Images/godic/202501/21/F-111F_dropping_high-drag_bombs2050.jpg")
An unguided bomb, also known as a free-fall bomb, gravity bomb, dumb bomb, or iron bomb, is a conventional aircraft-delivered bomb that does not contain a guidance system and hence, simply follows a ballistic trajectory.
This described all aircraft bombs in general service until the latter half of World War II, and the vast majority until the late 1980s.