| Acronym | Definition |
|---|
| GRB | Gamma Ray Burst(er) |
| GRB | General Purpose Rename Buffer |
| GRB | Graduate Recruitment Bureau |
| GRB | Gender Responsive Budget (various organizations) |
| GRB | Graduated Retirement Benefit (UK) |
| GRB | Grape Root Borer (insect) |
| GRB | Grid Resource Broker |
| GRB | Gharb (postal locality, Malta) |
| GRB | Global Resource Broker |
| GRB | Global Resource Bank (communal bank) |
| GRB | Grootschalig Referentiebestand (Dutch: large scale mapping program) |
| GRB | Green Bay, WI, USA - Austin/Straybel Field (Airport Code) |
| GRB | G. Ray Bodley (High School) |
| GRB | Green Red Blue |
| GRB | Government Retirement & Benefits, Inc. |
| GRB | General Revenue Bonds |
| GRB | Globally Responsible Birthing |
| GRB | Global Relationship Banking |
| GRB | Granatbuechse (German WWII anti-tank grenade rifle) |
| GRB | Geophysics Research Board |
| GRB | Government Reservation Bureau |
| GRB | Golden Radio Buffs of Maryland (old-time radio) |
| GRB | Grand Rose Band |
| GRB | General Radio Broadcast |
| GRB | Gabriel Richard Building |