Cornell Amplification is a boutique British amplifier company founded in 1991 by Denis Cornell, operating from a workshop in Southend-on-Sea, Essex. Before establishing his own brand, Denis worked at Vox amplification and assisted Tom Jennings with the company's 1976 relaunch, and he later contributed as a freelance engineer to Fender (Europe) and the Arbiter Group in London, where he worked on the original Fuzz Face.

The company specializes in hand-wired, all-valve guitar amplifiers built point-to-point without printed circuit boards. The range includes low-wattage combos like the Romany 10, Romany 12 Reverb, and Traveller 5, higher-powered heads and combos such as the Plexi 7 mkII, Plexi 20, Studio 20, Studio 50, and Voyager 20, alongside Elite speaker cabinets and accessories including The Switcher and the Legacy Fuzz pedal. Amps are generally built to order in small numbers.

Cornell amps have been used by a number of high-profile players, with the company naming Eric Clapton, Gary Moore, Hank Marvin, Andy Fairweather Low, Wilko Johnson, Robin Trower, KT Tunstall, and Katie Melua among the artists who have played its designs.

Dennis Cornell has 1 product cataloged on Equipboard, including Fuzz Effects Pedals.