Dr. Green is a line of guitar and bass effects pedals produced by UK-based Ashdown Engineering, headquartered in Essex. The brand was introduced as a pedal-focused offshoot — with bass effects tied to Ashdown's bass amplifier heritage and guitar effects launched in conjunction with Ashdown's Hayden guitar amplifier sub-brand. All pedals are handbuilt in the UK, feature true-bypass switching, and are housed in heavy-duty custom steel enclosures backed by a five-year limited warranty.

The bass-oriented lineup includes the Octa Dose octaver, the Bearded Lady fuzz, the Doctor's Note envelope filter, the Bass Verb reverb, and the Aspirin and Tourniquet compressors. The guitar-oriented side of the range covers the Hairy Tongue fuzz, the Waiting Room delay, the Cubicle reverb, the Life Support compressor, the Black Death overdrive/distortion, and the Tune Up tuner.

The range is distinguished by its whimsical medical-themed naming scheme, with pedals referencing waiting rooms, aspirin, and tourniquets. Dr. Green pedals are distributed through Ashdown Music and sold via retailers including Reverb, Gear4music, and Guitar Center.

Dr. Green has 9 products cataloged on Equipboard, including Reverb Effects Pedals, Fuzz Effects Pedals, and Compressor Effects Pedals. Their gear is featured by 2 artists, with the strongest followings in Rock. Notable users include Dave Hollingworth and Guy Pratt.