| Abbreviation | Definition |
|---|---|
| GMOA | Global Mission Of Art |
| GMOA | Greenville Museum Of Art |
| GMRC | Glasgow Museums Resource Centre |
| GNSM | Gwacheon National Science Museum |
| GPMC | Greater Pittsburgh Museum Council |
| GPTM | Great Plains Transportation Museum |
| GRAM | Grand Rapids Art Museum |
| GRM | Galveston Railroad Museum |
| GRM | Grand River Museum |
| GSHF | Georgia Sports Hall of Fame |
| GSHM | Greater Southwest Historical Museum |
| GSMC | Grassroots Science Museums Collaborative |
| GUM | Galleries Und Museums |
| GVM | Great Valley Museum |
| GWCM | George Washington Carver Museum |
| HBM | Houston Bead Museum |
| HBOM | Harbor Branch Oceanographic Museum |
| HDRM | Heart of Dixie Railroad Museum |
| HEM | Historical Electronics Museum |
| HFFM | Hellenic Federation of Friends of Museums |