Dr Green is a UK-based effects pedal line produced by Ashdown Engineering, the British bass amplification company. The brand grew out of a collaboration with Dave Green, a longtime amp designer associated with Matamp and Ashdown's guitar sister brand Hayden, and the pedals are hand-built in England with steel enclosures, true-bypass switching, and a focus on bass-oriented circuits.

The range is built around five core stompboxes aimed primarily at bass players: the Tourniquet/Aspirin optical compressor, the Octa Dose analog octaver (derived from the sub-harmoniser circuit found in Ashdown bass heads), the Bearded Lady fuzz/distortion, the Doctors Note envelope filter, and the Bass Verb reverb. The line also includes the TuneUp chromatic tuner pedal. An earlier guitar-focused incarnation of Dr Green was launched through Hayden before the bass-oriented Ashdown range took over as the brand's main identity.

Dr Green pedals are distributed through Ashdown's dealer network and sold via Ashdown's own storefront, with the line positioned as a more boutique, hand-assembled complement to Ashdown's amplifier catalog rather than a standalone company.

Dr Green has 3 products cataloged on Equipboard, including Filter Effects Pedals, Reverb Effects Pedals, and Overdrive Effects Pedals. Their gear is featured by 1 artist, with the strongest followings in Rock. Notable users include Dave Hollingworth.