| GMTC | Gateway Missions Training Course 
| Others |
| GMTC | General Motors Technical Centre
| Others |
| GMTC | General Motors Truck Club
| Others |
| GMTC | General Motors Truck Company
| Others |
| GMTC | Generalized Mobile Transaction Commit
| Others |
| GMTC | Gland Manufacturers Technical Committee
| Others |
| GMTC | Gland Manufacturers Trade Committee
| Others |
| GMTC | Glasgow Marine Technology Centre
| Others |
| GMTC | Global Maritime Training Centre
| Others |
| GMTC | Gloria Material Technology Corp
| Others |
| GMTC | Gloucester Maritime Trade Campus
| Others |
| GMTC | Gospel Ministries To Children
| Others |
| GMTC | Gospel Music Training Center
| Others |
| GMTC | Great Midwest Trivia Contest
| Others |
| GMTC | Greater Metro Telecommunications Consortium
| Others |
| GMTC | Greater Midwest Trading Co
| Others |
| GMTC | Green Mountain Teachers Camp
| Others |
| GMTC | Green Mountain Training Center
| Others |
| GMTC | Guam Marianas Training Center
| Others |
| GMTC | Gunner's Mate (technician) Chief Petty Officer
| Others |
| GMTC | Gunner's Mate (turrets) Chief Petty Officer
| Others |