| Acronym | Definition |
|---|
| GTI➣Gas Technology Institute |
| GTI➣Grid-Tie Inverter (electronic device) |
| GTI➣Global Taxonomy Initiative |
| GTI➣Gasoline Turbo Injection |
| GTI➣Global Translation Institute (Portland, OR) |
| GTI➣Gateway Terminals India (joint venture) |
| GTI➣Good Time Interval |
| GTI➣Grand Turk Island |
| GTI➣Gordon Trucking, Inc. (Pacific, WA) |
| GTI➣Genital Tract Infection |
| GTI➣Guelph Turfgrass Institute |
| GTI➣Global Taekwondo International (martial arts) |
| GTI➣Global Threat Intelligence |
| GTI➣Green Theme International |
| GTI➣Global Temperature Increase (climate) |
| GTI➣Government Training Institute, Inc. (Idaho) |
| GTI➣Growing Through It (Coos Bay, OR) |
| GTI➣Galway Technical Institute |
| GTI➣Guilford Transportation Industries |
| GTI➣Gordon Training International |
| GTI➣Groundwater Technology Inc |
| GTI➣Georgia Transportation Institute |
| GTI➣Grand Touring Injection |
| GTI➣Global Trade Information Services, Inc |
| GTI➣Gires Tournois Interferometer |
| GTI➣Ground Transport Interchange (airports) |
| GTI➣Göteborgs Tekniska Institut (Swedish: The Technical Institute of Gothenburg) |
| GTI➣German Travel International (German travel agency) |
| GTI➣Global Title Indicator (SS7 SCCP) |
| GTI➣Go Traffic Interactive (Sacramento, CA) |
| GTI➣Garantie de Temps d'Intervention (French: Guaranteed Response Time) |
| GTI➣Group Travel Insurance |
| GTI➣Government Technology International |
| GTI➣Group Term Insurance |
| GTI➣Ground Test Instrumentation |
| GTI➣Grounded Theory Institute (Mill Valley, CA, USA) |
| GTI➣Groep Technische Installaties (Dutch company) |
| GTI➣Government Telecommunications, Incorporated |
| GTI➣General Telemarketing International Inc (Denton, Texas) |
| GTI➣GPS Timing Interfaces (Sprint) |
| GTI➣Genotoxic Impurity |
| GTI➣Ground Test Instruction (aircraft) |