| GCAS | Ground Collision Avoidance System | 地面防撞系统 |
| GCAS | Greater City Aquarium Society | 大城市水族馆协会 |
| GCAS | God's Country Astronomical Society | 神的国天文协会 |
| GCAS | Greater Cincinnati Aquarium Society | 大辛辛那提水族馆协会 |
| GCAS | Gold Coast Aquarium Society (Australia) | 黄金海岸水族馆协会（澳大利亚） |
| GCAS | Goth Chick Appreciation Society | 哥特鸡鉴赏协会 |
| GCAS | Girls Central Art School (Australia) | 中央女子艺术学校（澳大利亚） |
| GCAS | Government Common Application System (Hong Kong) | 政府公共应用系统（中国香港） |
| GCAS | Graduate Course of Academic Study | 学术研究研究生课程 |
| GCAS | Guilford County Animal Shelter | 吉尔福德县动物收容所 |
| GCAS | God as Causal Agent Scale | 上帝作为因果因素量表 |
| GCAS | General Conference Auditing Service (Seventh-Day Adventist Church) | 大会审计服务（基督复临安息日会） |
| GCAS | Global Customer Assistance Service | 全球客户支持服务 |
| GCAS | Global Corporate Audit Services | 全球公司审计服务 |
| GCAS | Great Canadian Artist Series | 伟大的加拿大艺术家系列 |
| GCAS | Gloucester County Animal Shelter | 格洛斯特县动物收容所 |
| GCAS | Gsgeneral Computing And Software | 通用计算和软件 |
| GCAS | Grants and Contracts Accounting Services | 赠款和合同会计服务 |
| GCAS | general channel allocation scheme | 通用信道分配方案 |
| GCAS | General Computing and Software | 通用计算和软件 |
| GCAS | Gibson County Animal Services | 吉布森县动物服务 |
| GCAS | General Conference Auditing Service | 大会审计处 |
| GCAS | Graduate Certificate Program in Applied Statistics | 应用统计学研究生证书课程 |
| GCAS | Grant County Archeological Society | 格兰特县考古学会 |
| GCAS | Graduate Certificate in Antarctic Studies | 南极研究生证书 |
| GCAS | Golden Cradle Adoption Services | 金摇篮收养服务 |
| GCAS | Government Cost Accounting System, Inc. | 政府成本会计系统公司。 |
| GCAS | General Cost Allocation System | 一般成本分配制度 |
| GCAS | Gas Chromatograph Analyzer Server | 气相色谱分析仪服务器 |
| GCAS | General College and Arts and Sciences | 普通学院和文理学院 |
| GCAS | Ground Alert Close Air Support | 地面警戒近距离空中支援 |
| GCAS | Genesee County Animal Shelter | Genesee县动物收容所 |