D.W. Fearn is a Pennsylvania-based manufacturer of high-end vacuum tube audio equipment, founded in 1993 by Douglas W. Fearn. Operating from Chester County, about 25 miles west of Philadelphia, the company built its reputation on hand-built, all-tube signal processors housed in distinctive red chassis, starting with the VT-1 single-channel microphone preamplifier. Doug Fearn's background in broadcast engineering and classical recording shaped a design philosophy centered on transformer-coupled, Class A tube circuits aimed at professional tracking, mixing, and mastering applications.

The product line is compact but well-regarded in the professional audio community. Core offerings include the VT-1 and VT-2 vacuum tube microphone preamplifiers, the VT-5 stereo tube equalizer with LC-type passive circuitry inspired by classic American program EQs of the 1960s, and the VT-7 stereo/dual mono mastering and mix bus compressor that pairs tube gain-reduction stages with modern PWM control circuitry. The brand also produces accessories such as the VPF vented rack panel and has licensed software emulations, including a VT-7 plug-in released through Mixwave.

Manufacturing and day-to-day operations were taken over by brothers Geoff and George Hazelrigg of Hazelrigg Industries in Bucks County, Pennsylvania, while Doug Fearn continues as principal designer. D.W. Fearn gear is commonly found in commercial and project studios and is frequently grouped with boutique American tube outboard alongside brands like Manley and Pendulum Audio.

D.W. Fearn has 7 products cataloged on Equipboard, including Preamps and Effects Processors. Their gear is featured by 4 artists, with the strongest followings in Rock, Pop, and Funk / Soul. Notable users include Bootsy Collins, Philippe Zdar, and Dave Clauss.