| Abbreviation | Definition |
|---|---|
| GMST | Greenbelt Municipal Swim Team |
| GOST | Great Ohio Swim Team |
| GOST | Greater Owego Swim Team |
| GPAC | Greater Pensacola Aquatic Club |
| GSD | Go Swimming Day |
| HAST | Hilltop Aquatic Swim Team |
| HAST | Hilton Area Swim Team |
| HJSC | Hounslow Jets Swimming Club |
| HLST | Helena Lions Swim Team |
| HMSD | Harvard Mens' Swimming and Diving team |
| HMST | Hopkins Mariner Swim Team |
| HSA | Huntsville Swim Association |
| HSIW | Hotel Swimming In Wales |
| HWSC | Havant and Waterlooville Swimming Club |
| IHSSA | Idaho High School Swimming Association |
| IISA | International Ice Swimming Association |
| IMSIA | International Mermaid Swimming Instructors Association |
| IOS | Institute Of Swimming |
| ISI | Illinois Swimming, Inc. |
| ISL | Irvine Swim League |