| GU | Galactic Unit 
| Others |
| GU | Galgotias University
| Others |
| GU | Game Used
| Others |
| GU | Gameplay Update
| Others |
| GU | Gamer Unlimited
| Others |
| GU | Games United
| Others |
| GU | Gaming Universe
| Others |
| GU | Gastric ulcer
| Others |
| GU | Gastroenterology Urology
| Others |
| GU | Gauhati University
| Others |
| GU | Geitourinary
| Others |
| GU | Gene Upshaw
| Others |
| GU | Genel Uyum
| Others |
| GU | General Use
| Others |
| GU | General Utility
| Others |
| GU | Genito Urinary
| Others |
| GU | Genito-Urinary
| Others |
| GU | Genitourinary
| Others |
| GU | Geographical Unit
| Others |
| GU | Geographically Undesirable
| Others |
| GU | Geography Unplugged
| Others |
| GU | Georgetown University
| Others |
| GU | Geriatric Unit
| Others |
| GU | Glasgow University
| Others |
| GU | Glenn Underground
| Others |
| GU | Global Ultimate
| Others |
| GU | Global Underground
| Others |
| GU | Global Unshared
| Others |
| GU | Global Update
| Others |
| GU | Globally Unique
| Others |
| GU | Glucose Unit
| Others |
| GU | Glucose Uptake
| Others |
| GU | Glucose Utilisation
| Others |
| GU | Goldblatt unit
| Others |
| GU | Golden Unicorn
| Others |
| GU | Gonzaga University
| Others |
| GU | Government Unit
| Others |
| GU | Graduate Union
| Others |
| GU | Grafton and Upton Railroad
| Others |
| GU | Grafton and Upton Railroad Company
| Others |
| GU | Grand Unification
| Others |
| GU | Grand Union
| Others |
| GU | Grantham University
| Others |
| GU | Gravity Unit
| Others |
| GU | Greek Unlimited
| Others |
| GU | Greenwich University
| Others |
| GU | Grid Unit
| Others |
| GU | Griffith University
| Others |
| GU | Grow Up
| Others |
| GU | Grown Up
| Others |
| GU | Guam
| State |
| GU | Guard Unit
| Others |
| GU | Guard University
| Others |
| GU | Guardian Ubiquitos
| Others |
| GU | Guardian Unlimited
| Others |
| GU | Gujarati
| Others |
| GU | Gulburga University
| Others |
| GU | Gulton
| Others |
| GU | The Guild Underground
| Others |