| GCT | Galactic Coordinated Time 
| Others |
| GCT | Gate Control Theory
| Others |
| GCT | Gauge Convertible Train
| Others |
| GCT | General Chat Thread
| Others |
| GCT | General Consumption Tax
| Others |
| GCT | General Corporation Tax
| Others |
| GCT | Generic Coverage Tool
| Others |
| GCT | Geographic Comparison Tables
| Others |
| GCT | Germ Cell Tumour
| Others |
| GCT | German Company Tract
| Others |
| GCT | Germantown Community Theatre
| Others |
| GCT | Giant Cell Tumor
| Others |
| GCT | Gifted Child Today
| Others |
| GCT | Global Caravan Technologies
| Others |
| GCT | Global Champions Tour
| Others |
| GCT | Global Circuit Technology
| Others |
| GCT | Global Connector Technology
| Others |
| GCT | Global Container Terminals
| Others |
| GCT | Glucose Challenge Test
| Others |
| GCT | GOES cloud type
| Others |
| GCT | Gogo Chauka Thakur
| Others |
| GCT | Google Cloud Tools
| Others |
| GCT | Google Conversion Tracking
| Others |
| GCT | Government College of Technology
| Others |
| GCT | Grace Chen Time
| Others |
| GCT | Grand Central Tech
| Others |
| GCT | Grand Central Terminal
| Others |
| GCT | Grand Cherokee Trailhawk
| Others |
| GCT | Grand Chess Tour
| Others |
| GCT | Grand Circle Travel
| Others |
| GCT | Granulosa Cell Tumor
| Others |
| GCT | Great Chinese Takeout
| Others |
| GCT | Green Country Triumphs
| Others |
| GCT | Greendale Community Theatre
| Others |
| GCT | Greene County Tech
| Others |
| GCT | Greene County Transit
| Others |
| GCT | Greenwhich Civil Time
| Others |
| GCT | Greenwich Civil Time
| Others |
| GCT | Greenwich Civil Time (suggested replacement name, in 1925, for GMT)
| Others |
| GCT | Gridport Client Tools
| Others |
| GCT | Ground Contact Time
| Others |
| GCT | Gulf Concrete Technology
| Others |
| GCT | Gwinnett County Transit
| Others |