Dewtron (Design Engineering (Wokingham) Ltd. or D. E. W. Ltd.) were a small British manufacturer of modular synthesizers which were sold to customers in kit form or as built units. It was founded by Brian Baily on 5 February 1964 in Wokingham, Berkshire. By 1970 the company's products included oscillators, voltage controlled amplifiers, sample and hold and envelope shapers.
Mike Rutherford used a Dewtron "Mister Bassman" bass pedal synthesizer on Genesis albums from Nursery Cryme (1971) onwards, before replacing it with a Moog Taurus I for the album A Trick of the Tail (1976). Chris Carter, later to form Throbbing Gristle, experimented with Dewtron kit-based synthesizers early in his music career.
The company later moved to the Ferndown area in Dorset (near Wimborne Minster) and shipped some synthesizer modules and related products from there before closing.