Johnson Amplification was a guitar amplifier company founded by John Johnson and operated as a subsidiary of DigiTech under the Harman Music Group. Based in Sandy, Utah, the company produced guitar amplifiers from the late 1990s into the early 2000s, carving out a niche in the emerging amp-modeling category by combining digital modeling with analog tube circuitry.

The brand is best known for its Millennium series, marketed as the first tube-integrated modeling amplifiers. Models like the JM-150 stereo combo and the JM-250 head offered dozens of amp models with two voicing variants each, onboard effects, and preset storage, powered through Celestion Vintage 30 speakers in the combo configuration. The JM-150 received the 1998 Music and Sound Retailer Award for best new guitar amplifier. Other notable products included the Marquis JM120 stereo combo, the JT-50 practice amp, and the J-12 and J3 foot controllers.

The J-Station, a desktop amp and effects modeler positioned as a competitor to the Line 6 POD, extended the brand beyond combos and heads. It packaged 18 guitar amp, bass amp, and acoustic simulator models alongside compression, modulation, pitch shifting, delay, and reverb into a compact tabletop unit. Johnson amplifiers retain a following on the used market among players interested in hybrid tube/modeling designs from that era.

Johnson Amplification has 8 products cataloged on Equipboard, including Combo Guitar Amplifiers, Guitar Amplifier Cabinets, and Switch Effects Pedals. Their gear is featured by 5 artists, with the strongest followings in Rock, Metal, and Pop. Notable users include Adrian Belew, Yngwie Malmsteen, and David A. Stewart.