This is a list of Wikipedia articles about brand-name companies (past and present) that have sold guitars, and the house brands occasionally used.
A
Airline
Alembic
Alvarez
Ampeg
Antoria
Aria
Ashton Music
Avalon
B
Babicz
Bailey, John
B.C. Rich
Behringer
Blackbird
Blade
Bohemian
Bond Electraglide
Brawley
Breedlove
Burns
C
C.R. Alsip
Campbell
Caparison
C.F. Martin
Chapman
Charvel
Chesbro
Cole Clark
Collings
Conde
Cort
D
D'Alegria
D'Angelico
Daisy Rock Girl
Danelectro
Dean
Diamond
D'Aquisto, Jimmy
Dobro
Duesenberg
E
Eastwood
Eccleshall
El Degas
Epiphone
ESP
Eko
Electrical
Ernie Ball
F
Fano
Farida
Fender
Fernandes
First Act
Flaxwood
Floyd Rose
Fodera
Framus
Freshman
Fret-King
FujiGen
Furch
G
G&L
Gallotone
Garrison
Giannini
Gibson
Gilberto Grácio
Gittler
Godin
Gordon-Smith
Greco
Greg Bennett
Gretsch
Guild
Guyatone
H
Hagström
Hallmark Guitars
Hamer
Harley Benton
Harmony
Heritage
Höfner
Hohner
Hondo
Hora
Huss & Dalton Guitar Co.