| Abbreviation | Definition |
|---|---|
| GPTC | Greater Portland Tennis Council |
| GPTL | Grand Prix de Tennis de Lyon |
| GPTL | Greater Pottstown Tennis and Learning |
| GPTL | Greater Pottstown Tennis Learning |
| GTLF | Global Tennis Legacy Foundation |
| GTTA | Geng Table Tennis Academy |
| GTTA | Goa Table Tennis Association |
| GTTA | Guernsey Table Tennis Association |
| GTTA | Guyana Table Tennis Association |
| GWTA | Greater Washington Tennis Association |
| GWTA | Greater Wilmington Tennis Association |
| GWTC | George Ward Tennis Center |
| GWTC | Great Whittier Tennis Club |
| GWTL | Gastonia Women's Tennis League |
| HCTA | Harford Community Tennis Association |
| HCTL | Home Court Tennis League |
| HCTL | Home Court Tennis Leagues |
| HFTC | Homer Ford Tennis Center |
| HLTA | Houston Ladies Tennis Association |
| HPLTC | Holland Park Lawn Tennis Club |