Crucial Audio is a boutique American audio gear company founded in 2005, with design, assembly, and testing carried out in southern Delaware. The brand specializes in vacuum tube–based effects pedals and studio processors aimed at guitarists, engineers, and producers, marketing its products under the tagline "Luxurious Sonic Devices."

The lineup centers on hand-built tube units that blur the line between stompbox and studio outboard. Notable products include the Echo-Nugget and Time Warp vacuum tube analog delays, the Tone-Nugget tube booster, the WahVelope (a tube auto-wah/envelope filter with onboard overdrive), the Apollo-18 Leslie interface, and the DUB-1 and DUB-5 tube direct boxes and recording interfaces. The rackmount and stereo versions of the Studio-Nugget extend the analog tube delay concept into studio formats.

With its all-tube signal paths, premium pricing, and small-shop output, Crucial Audio occupies a niche on the higher end of the boutique pedal and outboard market, distributed in part through specialty retailers such as Vintage King.

Crucial has 2 products cataloged on Equipboard, including Computers & Peripherals.