| GCT | Greenwich Civil Time | 格林威治平均时间 |
| GCT | Great Circle Track | 大圆轨迹 |
| GCT | Grand Central Terminal (New York, NY) | Grand Central Terminal（纽约州纽约市） |
| GCT | Global Communication Technology | 全球通信技术 |
| GCT | General Competency Test | 一般能力测试 |
| GCT | General Consumption Tax | 一般消费税 |
| GCT | granular cell tumor | 颗粒细胞瘤 |
| GCT | granulocytotoxin | 粒细胞毒素 |
| GCT | Greenwich Civil Time [ GMT - 0000] | 格林威治市民时间[GMT-0000] |
| GCT | Generic Coverage Tool | 通用覆盖工具 |
| GCT | Giant Cell Tumour Context: bone tumours | 巨细胞瘤背景：骨肿瘤 |
| GCT | Grand Central Terminal | 大中央航站楼 |
| GCT | Gate Control Theory | 闸门控制理论 |
| GCT | Germ Cell Tumour | 生殖细胞肿瘤 |
| GCT | Generator Coolant Temperature | 发电机冷却液温度 |
| GCT | Granulosa Cell Tumor | 颗粒细胞瘤 |
| GCT | Gifted Creative and Talented (educational program) | 天才创意和天才（教育计划） |
| GCT | Government College of Technology | 政府技术学院 |
| GCT | Generalized Context Tree | 广义上下文树 |
| GCT | General Classification Test | 一般分类试验 |
| GCT | GUI Cut-Through | GUI直通 |
| GCT | Giant Cell Tumor | 巨细胞瘤 |
| GCT | Gifted Child Today | 今天的天才儿童 |
| GCT | Ground Cavalry Troop | 地面骑兵部队 |
| GCT | Guaranteed Completion Time | 保证完成时间 |
| GCT | Governor's Conference on Tourism | 州长会议旅游 |
| GCT | Government Competitive Test | 政府举行的竞赛试验 |
| GCT | Great Canary Telescope | 大金丝雀望远镜 |
| GCT | Gensan College of Technology (General Santos City, Philippines) | Gensan理工学院（菲律宾桑托斯将军市） |
| GCT | Glucose Challenge Test | 葡萄糖激发试验 |
| GCT | Grand Cadence de Tir (French: great rate of fire; artillery weapon) | 大Cadence de Tir（法语：大射速；火炮武器） |