The Optigan (Optical Organ) was an electronic keyboard instrument designed for the consumer market in 1968-70 by a subsidiary of toy manufacturer Mattel of El Segundo, California.

The unusual feature of the Optigan was its method of sound synthesis which optically read graphic representations of waveforms from a series of 12 inch celluloid discs. The Optigan was essentially an optical sampler; the discs contained 57 loops of sounds which were recordings of real instruments, 37 of the loops were reserved for keyboard sounds ( with individual loops for each key) the other 20 loops being sound effects, rhythms etc. The celluloid discs were sold as a collection for Optigan owners and were mainly sustained organ sounds, as the continually spinning loops had no beginning or end it was impossible to create an attack or decay.

Later versions (built under license and aimed at the professional market) were sold under the name Orchestron.