Manufacturers
- Galaxy Electronics
- Gates Radio Company
- GC Electronics
- Geloso
- Genelec OY
- General Electric
- General Radio Company
- General Resistance Instruments
- Generalmusic
- Genicom
- Giant Electronics ltd.
- Giga Instrumentation
- Gigabyte
- Global Specialties Corporation
- Globe Electronics Inc.
- Goerz Electro
- Goldstar
- Gonset
- Good Will
- Good Will Instrument Co.
- Gossen
- Gossen-Metrawatt
- Gould
- Gradiente
- Graetz
- Granville-Phillips Co.
- Grindmaster Corporation
- Grundig
- GW Instek
