Emex is an obscure guitar maker associated with the Londaxe, a rare electric guitar produced in the mid-1990s. The Londaxe was designed by Jerry Auerswald, the same designer responsible for custom instruments built for Prince, and its silhouette is often described as a more abstract take on the Fender Telecaster. Typical specifications include a poplar or hard maple body, a maple neck with an Indian rosewood fingerboard, two single-coil pickups, a fixed bridge, and a simple control layout of one volume, one tone, and a three-way switch, with hardware from suppliers such as Sperzel and Schaller.

The brand never reached wide distribution and information about its origins is sparse, with surviving examples turning up mainly through collector channels, secondhand listings, and enthusiast forums. The Londaxe gained a measure of notoriety through Matthew Bellamy of Muse, who played a yellow example during the Showbiz era, including in the music video for "Uno." Today the guitar is treated primarily as a collector's curiosity, traded among Muse fans and players drawn to unusual 1990s boutique builds.

Emex Londaxe has 2 products cataloged on Equipboard, including Solid Body Electric Guitars. Their gear is featured by 1 artist, with the strongest followings in Rock. Notable users include Matthew Bellamy.