Mesa/Boogie is an American amplifier manufacturer founded in 1969 by Randall Smith in the San Francisco Bay Area. The company's origins trace back to Smith's work modifying small Fender amplifiers, where a chance demo of a heavily modified Fender Princeton by Carlos Santana gave the brand its name — Santana reportedly declared the amp "really boogies." From those early hand-built beginnings in Marin County, Mesa/Boogie grew into one of the most influential names in guitar amplification, widely credited as a pioneer of the boutique amplifier industry and headquartered in Petaluma, California.

The company's flagship lines have defined the sound of multiple eras of rock and metal. The Mark Series — spanning from the original Mark I through the Mark VII — established a template for high-gain, channel-switching amplifiers with rich, harmonically complex overdrive. The 1980 Mark II introduced what is widely regarded as the world's first channel-switching amplifier. The 1991 Dual Rectifier became equally iconic, its massive, sag-driven tone shaping the sound of hard rock and heavy metal for decades. Additional lines including the Lone Star, Road King, Stiletto, Express, and Nomad series broadened the brand's tonal reach, while Mesa/Boogie also produces bass amplification, guitar cabinets, and effect pedals.

Mesa/Boogie amplifiers have attracted players across a wide range of genres and eras — from Carlos Santana and members of The Rolling Stones to Metallica's James Hetfield and Kirk Hammett, whose use of the Mark IIC+ helped cement that model's legendary reputation among high-gain players. The brand's amplifiers are characterized by hand-crafted construction, extensive tonal versatility within a single chassis, and a long-standing commitment to domestic manufacturing.

Mesa/Boogie has 478 products cataloged on Equipboard, including Guitar Amplifier Heads, Combo Guitar Amplifiers, and Guitar Amplifier Cabinets. Their gear is featured by 1164 artists, with the strongest followings in Rock, Metal, and Pop. Notable users include John Petrucci, Ola Englund, and James Hetfield. Most Mesa/Boogie products sit firmly in the high-end, boutique range.