Dr. No Effects is a boutique guitar pedal builder based in Eindhoven, the Netherlands, handcrafting effects since the early 2000s. The brand's founder operates under the pseudonym "Dr. No" and maintains a degree of anonymity. Known for limited-edition runs — often as few as 5 to 100 units — the company produces pedals with unconventional, artsy enclosure designs alongside more traditional formats. Signature models include the SkullFuzz, the foam-encased Turd Fuzz, the Drive-O-Matic overdrive, the Mother Brain Delay, and the Holy Wahcamoly wah pedal.

Dr. No Effects has developed a reputation in the boutique pedal world for collaborating directly with notable musicians. Troy Van Leeuwen (Queens of the Stone Age) has a signature Raven Filter + Booster pedal, Sarah Lipstate of Noveller collaborated on the Moon Canyon multi-effect, and Alain Johannes has a signature Fuzz + Filter 11:11. A custom Drive-O-Matic CC-SG was built for Chris Cornell's pedalboard. The brand's catalog spans fuzz, overdrive, delay, octave, filter, and wah effects, with many models combining multiple effect types into a single unit. Beyond standard production runs, Dr. No also maintains an "Analog Imaginarium" showcasing prototypes, one-offs, and rare creations from over two decades of building.

Dr. NO has 21 products cataloged on Equipboard, including Fuzz Effects Pedals, Overdrive Effects Pedals, and Distortion Effects Pedals. Their gear is featured by 15 artists, with the strongest followings in Rock, Pop, and Blues. Notable users include Alain Johannes, Troy Van Leeuwen, and Sarah Lipstate.