| ISGA | Idaho Senior Golf Association 
| Others |
| ISGA | Independent Schools Golf Association
| Others |
| ISGA | Industry and Services Golf Association
| Others |
| ISGA | Institute for the Study of Global Anabaptism
| Others |
| ISGA | Institute of Security and Global Affairs
| Others |
| ISGA | Integrated Services for Genomic Analysis
| Others |
| ISGA | Integrative Services for Genomic Analysis
| Others |
| ISGA | Interim Self Governing Authority
| Others |
| ISGA | International School Grounds Alliance
| Others |
| ISGA | International Social Games Association
| Others |
| ISGA | International Soybean Growers Alliance
| Others |
| ISGA | International Sport Grappling Association
| Others |
| ISGA | International Sugar Glider Association
| Others |
| ISGA | Irish Salmon Growers Association
| Others |