A supergun is a large gun designed to bombard from extremely far away. The World War I and II German military were especially interested in the development of these superweapons until rocketry supplanted the usefulness of the large railroad guns. The largest of the railroad guns deployed in World War I was the Paris Gun.

Saddam Hussein also funded Project Babylon to develop a gun capable of firing an object into orbit from where it could then drop onto any place on the Earth. The project leader Gerald Bull was allegedly assassinated to prevent the development, and the parts were confiscated before they were all exported from England.