Oberheim Viscount Joint Venture was a collaboration between the Oberheim brand (then owned by Gibson) and the Italian keyboard and organ manufacturer Viscount International, launched to develop and produce instruments carrying the Oberheim name. Manufacturing took place primarily in Italy, drawing on Viscount's expertise in organ voicing and digital sound generation. The arrangement spanned roughly the late 1980s through the early 2000s and ended with Oberheim ceasing operations shortly thereafter.

Products released under the joint venture include the OB-12 virtual analog polyphonic synthesizer, the OB-Mx rackmount synthesizer module, the GM-1000 24-bit guitar multi-effects processor, the MC series of master controllers (including the MC1000 in 76- and 88-key versions), the OB3² drawbar organ module, the OB32 tonewheel organ, and the MiniGrand piano sound module. The product range reflected the partnership's mix of strengths: Oberheim-style synthesis paired with Viscount's background in digital organs and pianos.

Gear from this era is now primarily of interest to vintage collectors and users seeking the distinctive sounds of instruments such as the OB-12, which has developed a cult following among synth enthusiasts. Units circulate on the used market through sellers and marketplaces rather than through an active manufacturer channel, as the joint venture is no longer in operation.

Oberheim Viscount Joint Venture has 2 products cataloged on Equipboard, including MIDI Keyboard Controllers and Organs. Their gear is featured by 2 artists, with the strongest followings in Rock and Stage & Screen. Notable users include Christian Lorenz and Dom Beken.