Great Eastern FX Co. is an independent guitar pedal company founded in 2021 by David Greeves, a former editor-in-chief of Guitar Buyer magazine and reviews editor at Sound On Sound. The company is based in Bottisham, a village between Cambridge and Newmarket in the East of England, and builds its pedals by hand in the UK using components selected for sonic performance rather than cost.

The brand's catalogue focuses on unconventional takes on familiar effects. Releases include the Small Speaker Overdrive, a dynamic low-gain drive designed to emulate the sound of a small amp pushed hard in the studio; the XO Variable Crossover, a utility pedal that splits a signal into high and low frequency bands for parallel processing; the Focus Fuzz and Focus Fuzz Deluxe; the Design-a-drive, a build-your-own overdrive platform; and the Distortion Filter D312A.

Great Eastern FX positions itself between vintage-inspired circuitry and modern design sensibilities, with an emphasis on eco-conscious packaging and locally sourced materials. The pedals have been stocked by retailers including Andertons and covered by outlets such as Guitar.com.

Great Eastern FX Co. has 3 products cataloged on Equipboard, including Overdrive Effects Pedals and Multi Effects Pedals. Their gear is featured by 3 artists, with the strongest followings in Rock, Folk, World, & Country, and Blues. Notable users include Chris Buck, Mark Webber, and Dave Powys.