Hayden is a British amplifier company based in the United Kingdom that designs hand-wired, valve-driven electric guitar amplifiers. Established in 2000, it operates as a sister brand to bass-amp specialist Ashdown Engineering, with much of its product development led by veteran amp designer Dave Green, formerly of Matamp. The company's output ranges from boutique hand-wired heads and combos built in England to more affordable offshore-manufactured models aimed at working players.

Hayden's catalogue centres on British-voiced valve circuits inspired by 1960s and 1970s tone, with offerings such as the Peacemaker, Classic Lead, Cotton Club, MoFo and Vanquish series. The amps are typically positioned as versatile platforms that span vintage cleans and crunch through to modern higher-gain territory, and the brand has also explored valve-based effect pedals.

The brand has been associated with players including Simon Neil of Biffy Clyro, Carl Barat of Dirty Pretty Things, and members of Eagles of Death Metal and Editors.

Hayden has 10 products cataloged on Equipboard, including Guitar Amplifier Cabinets, Guitar Amplifier Heads, and Compressor Effects Pedals. Their gear is featured by 6 artists, with the strongest followings in Rock. Notable users include Art Alexakis, Dave Catching, and Dan Beesley.