A pulsejet engine (also known as simply a "pulsejet") is a kind of jet engine. Its first significant use was as the propulsion system of Germany's V-1 missile, also known as the "buzz-bomb", due to the characteristically loud sound of the pulsejet.

The simplest version of the pulsejet consists essentially of a metal tube (acting as the combustion chamber), a fuel injector, and a reed valve.

Due to the simplicity of the design, interested hobbyists can build their own pulsejet engine.