Eowave is a small French electronic instrument company founded in 1998 by engineer and designer Marc Sirguy and based in Ivry-sur-Seine, just outside Paris. The company began developing sensor-based interfaces with an interest in early electronic instruments such as the Ondes Martenot and Trautonium, before evolving into the design of synthesizers and Eurorack modules. Its instruments are largely hand-built in small batches, with a stated focus on unconventional and expressive interfaces.

Eowave is best known for the Persephone, a monophonic analog ribbon synthesizer released in 2004 and updated as the Persephone Mark II, which uses a pressure- and position-sensitive ribbon to produce continuous, glissando-rich playing reminiscent of the Ondes Martenot. The brand's other notable products include the Quadrantid Swarm, a semi-modular hybrid Eurorack voice combining a triangle oscillator with wavefolding and a percussive secondary voice, and the Tempête Magnétique quad filter. Eowave also produces Eurorack cases and a growing line of 3U and 1U modules covering oscillators, mixers, VCAs, and utilities such as the Portail MIDI-to-CV interface.

The company occupies a boutique niche within the European modular scene, frequently associated with discrete-transistor circuitry, idiosyncratic feature sets, and a hands-on, experimental design philosophy. Its instruments are distributed through specialist synth retailers including Schneidersladen, Perfect Circuit, Big City Music, and the Paris-based Modularsquare shop.

Eowave has 10 products cataloged on Equipboard, including Modular Synthesizers, Synthesizers, and Tabletop Synthesizers. Their gear is featured by 5 artists, with the strongest followings in Electronic and Rock. Notable users include Jean Michel Jarre, Peter Christopherson, and Richard Devine.