| Rank | Abbreviation | Meaning |
|---|
| ***** | GBCA | ETFS Foreign Exchange Limited (London Stock Exchange [LSE])
| |
| ***** | GBCA | Gadolinium-Based Contrast Agent
| |
| ***** | GBCA | Green Building Council of Australia
| |
| **** | GBCA | Greater Baltimore Cultural Alliance
| |
| **** | GBCA | Green Building Council of Australia's
| |
| **** | GBCA | Goldsmith Borgal Company Architects
| |
| *** | GBCA | Greater Boston Council on Alcoholism
| |
| *** | GBCA | German Brown Coal Association
| |
| *** | GBCA | Grizzly Bear Conservation Area
| |
| *** | GBCA | General Building Contractors Association
| |
| *** | GBCA | Guyana Blind Cricket Association
| |
| ** | GBCA | Goldens Bridge Community Association
| |
| ** | GBCA | Greater Boston Concierge Association
| |
| ** | GBCA | Granite Bay Community Association
| |
| ** | GBCA | Galveston Bay Cruising Association
| |
| * | GBCA | Gallbladder carcinoma
| |
| * | GBCA | Grand Bahama Craft Association
| |
| * | GBCA | Green Bay Chess Association
| |
| * | GBCA | Grace Baptist Christian Academy
| |
| * | GBCA | Greater Brandywine Cultural Alliance
| |
| * | GBCA | Graphics-Based Control Architecture
| |
| * | GBCA | Great Band of Christmas Aid
| |
| * | GBCA | Grassland Bird Conservation Area
| |
| * | GBCA | Greater Boston Cable Advertising
| |
| * | GBCA | General Burns Community Association
| |