- G&L
- G.Skill
- G7th
- Gadget Gear
- Galaxy Audio
- GallienKrueger
- Gamechanger Audio
- GAMMA
- Gard
- Garritan
- Gator
- GATOR CABLEWORKS
- Gazley
- Gear One
- GEEHOOD
- Geforce
- GekkoScience
- GelRest
- Gem Sound
- GEM Swabs
- Gemini
- Genalex
- Genelec
- Generic
- Genzler Amplification
- Georg Werner
- George Ls
- Getm Getm
- Getzen
- GForce
- GHS
- Giannini
- Giardinelli
- Gibraltar
- Gibson
- Gibson Custom
- Gigabyte
- Gigastone
- GiGimundo
- Gitane
- Glaesel
- Glasser
- GLOBAL TRUSS
- Glorious
- GLOTRENDS
- Glyph
- Glyph Production Technologies
- Godin
- Godlyke
- GoHardDrive
- Gold Tone
- Golden Age Project
- Golden Bridge
- Golden Gate
- GOLREX
- Gon Bops
- Gonzalez
- GoPro
- Gotega
- Gotoh
- GPC Image
- Grace Design
- Grace Designs
- Grado
- Grand Concert Select
- Graph Tech
- GRAUGEAR
- GRAVITY PICKS
- Gravity Stands
- GREENBOX
- Gresur
- Gretsch
- Gretsch Drums
- Gretsch Guitars
- Groove Synthesis
- Groove Tubes
- GROOVETECH TOOLS INC.
- Grover
- Grover Pro
- GroverTrophy
- Gruv Gear
- GruvX
- GTechnology
- Guild