Analogue Systems is a British modular synthesizer manufacturer based in Cornwall, England. Founded by Bob Williams — a vintage synth collector turned builder — the company launched its first product, the FB3 Filter Bank, at the 1994 Frankfurt Musikmesse. Williams partnered with Steve Gay, a former EMS engineer, whose circuit designs draw heavily from the British electronic music tradition established by EMS in the 1970s. The company went on to become one of the pioneering names in Eurorack modular synthesis, developing its system around the same time as Doepfer.

Analogue Systems is best known for the RS Integrator series of Eurorack modules, which span oscillators (RS-95N), filters (RS-100N Lowpass, RS-110N Multimode), envelope generators (RS-60N), effects (RS-650 Echo/Reverb), sequencers, and more. The modules are available individually or as complete systems housed in walnut wood cabinets, such as the RS-8000 and RS-8500. The company also produces distinctive keyboard controllers, including the French Connection — an Ondes Martenot-inspired performance controller developed at the request of Radiohead's Johnny Greenwood — and the Spawn monophonic synthesizer.

The brand's client list includes Radiohead, Nine Inch Nails, Goldfrapp, Portishead, Muse, Hans Zimmer, the Chemical Brothers, Autechre, and Sigur Rós, among others. Modules are handbuilt in Cornwall and distributed through specialist dealers in Berlin, London, and Los Angeles.

Analogue Systems has 20 products cataloged on Equipboard, including Modular Synthesizers. Their gear is featured by 7 artists, with the strongest followings in Electronic, Rock, and Pop. Notable users include Nigel Godrich, DMX Krew, and Jonny Greenwood.