Ran Guitars is a Polish custom guitar workshop based in Gdańsk, established in 1991. The company specializes in custom and semi-custom electric and bass guitars built primarily for heavier styles of music, with a customer base concentrated in metal and progressive genres. Buyers configure instruments through detailed custom order specifications covering body woods, neck profiles, hardware, electronics, and finishes.

The Invader, an aggressive offset shape developed in collaboration with Piotr "Peter" Wiwczarek of the Polish death metal band Vader, is one of the shop's signature designs and the model most associated with the brand. Other recurring models include the Crusher and Thunder (an Ironbird-style body). Ran has built custom instruments for players including Pat O'Brien of Cannibal Corpse, Jeff Waters of Annihilator, Steffen Kummerer of Obscura, and Jocke Skog of Clawfinger.

Ran Guitars has 9 products cataloged on Equipboard, including Solid Body Electric Guitars. Their gear is featured by 7 artists, with the strongest followings in Rock and Metal. Notable users include Pat O'Brien, Wacław Kiełtyka, and Jeff Waters.