The Garin Death Ray, also known as The Death Box and The Hyperboloid of Engineer Garin (Russian: Гиперболоид инженера Гарина), is a science fiction novel by the noted Russian author Aleksey Nikolayevich Tolstoy written in 1926–1927.

The "hyperboloid" in its title is not a geometrical surface (though it is utilized in the device design) but a "death ray"-laser-like device (thought up by the author many decades before lasers were invented) that the protagonist, engineer Garin, used to fight his enemies and try to become the dictator of the world.

The idea of a "death ray" (popularized in The War of the Worlds by H. G. Wells, among others) was commonplace in science fiction of the time, but Tolstoy's version is unique for its level of technical details.

Larger "hyperboloids" can destroy military ships on the horizon, and those of less power can only injure people and cut electric cables on walls of rooms.

Professor Georgy Slyusarev [ru], an expert in optics, in his 1944 book "О возможном и невозможном в оптике" ("About Possible and Impossible in Optics") presented arguments about the infeasibility of Garin's device.