The fastest waves in the universe are electromagnetic waves, which travel at the speed of light (approximately 299,792,458 meters per second). This includes:

* Light (visible light)

* Radio waves

* Microwaves

* Infrared radiation

* Ultraviolet radiation

* X-rays

* Gamma rays

While some other waves, like gravitational waves, also travel incredibly fast, they are slightly slower than the speed of light.