Estradin was a Soviet-era electronic musical instrument manufacturer based at a radio plant in Zhytomyr, Ukraine, producing gear primarily during the 1980s. The factory built analog synthesizers, organs, and signal-processing units for the Soviet music market, and its instruments have since become collector items in the vintage synth community.

The brand is best known for its monophonic analog synthesizers, including the Estradin-230 and the refined Altair-231, both 3-VCO designs frequently compared to the Minimoog Model D for their fat low end and aggressive filter character. Other notable instruments include the Solaris-314, a polyphonic drawbar-style synthesizer-organ with per-key voice boards, and the Estradin 320. Beyond keyboards, the plant also produced outboard effects such as the PX-1100/RX-1100 delay-reverb unit and a range of guitar effect pedals including flangers and phasers.

Production wound down with the dissolution of the Soviet Union, and original units now circulate mainly through the second-hand market on platforms like Reverb, where they are sought after by enthusiasts of Eastern Bloc analog electronics.

Estradin has 4 products cataloged on Equipboard, including Effects Processors, Synthesizers, and Phaser Effects Pedals. Their gear is featured by 2 artists, with the strongest followings in Rock, Electronic, and Funk / Soul. Notable users include Yegor Letov and Nu Guinea.