| .surgery | Generic | Binky Moon, LLC | — | — |
| .suzuki | Generic | SUZUKI MOTOR CORPORATION | — | — |
| .sv | Country Code | SVNet | 🇸🇻El Salvador | — |
| .swatch | Generic | The Swatch Group Ltd | — | — |
| .swiss | Generic | Swiss Confederation | — | — |
| .sx | Country Code | SX Registry SA B.V. | 🇸🇽Sint Maarten | — |
| .sy | Country Code | National Authority for Information Technology Services (NAITS) | 🇸🇾Syria | — |
| .sydney | Generic | State of New South Wales, Department of Premier and Cabinet | — | — |
| .systems | Generic | Binky Moon, LLC | — | — |
| .sz | Country Code | University of Swaziland
Department of Computer Science | 🇸🇿Eswatini | — |
| .tab | Generic | Tabcorp Holdings Limited | — | — |
| .taipei | Generic | Taipei City Government | — | — |
| .talk | Generic | Amazon Registry Services, Inc. | — | — |
| .taobao | Generic | Alibaba Group Holding Limited | — | — |
| .target | Generic | Target Domain Holdings, LLC | — | — |
| .tatamotors | Generic | Tata Motors Ltd | — | — |
| .tatar | Generic | Limited Liability Company "Coordination Center of Regional Domain of Tatarstan Republic" | — | — |
| .tattoo | Generic | Registry Services, LLC | — | — |
| .tax | Generic | Binky Moon, LLC | — | — |
| .taxi | Generic | Binky Moon, LLC | — | — |
| .tc | Country Code | Melrex TC | 🇹🇨Turks and Caicos Islands | — |
| .tci | Generic | Emergency Back-End Registry Operator Program - ICANN | — | — |
| .td | Country Code | l'Agence de Développement des Technologies de l'Information et de la Communication (ADETIC) | 🇹🇩Chad | — |
| .tdk | Generic | TDK Corporation | — | — |
| .team | Generic | Binky Moon, LLC | — | — |
| .tech | Generic | Radix Technologies Inc. | — | — |
| .technology | Generic | Binky Moon, LLC | — | — |
| .tel | Sponsored | Telnames Ltd. | — | — |
| .temasek | Generic | Temasek Holdings (Private) Limited | — | — |
| .tennis | Generic | Binky Moon, LLC | — | — |
| .teva | Generic | Teva Pharmaceutical Industries Limited | — | — |
| .tf | Country Code | Association Française pour le Nommage Internet en Coopération (A.F.N.I.C.) | 🇹🇫French Southern Territories | — |
| .tg | Country Code | Autorité de Régulation des Communications Electroniques et des Postes (ARCEP) | 🇹🇬Togo | — |
| .th | Country Code | Thai Network Information Center Foundation | 🇹🇭Thailand | — |
| .thd | Generic | Home Depot Product Authority, LLC | — | — |
| .theater | Generic | Binky Moon, LLC | — | — |
| .theatre | Generic | XYZ.COM LLC | — | — |
| .tiaa | Generic | Teachers Insurance and Annuity Association of America | — | — |
| .tickets | Generic | XYZ.COM LLC | — | — |
| .tienda | Generic | Binky Moon, LLC | — | — |
| .tips | Generic | Binky Moon, LLC | — | — |
| .tires | Generic | Binky Moon, LLC | — | — |
| .tirol | Generic | punkt Tirol GmbH | — | — |
| .tj | Country Code | Information Technology Center | 🇹🇯Tajikistan | — |
| .tjmaxx | Generic | The TJX Companies, Inc. | — | — |
| .tjx | Generic | The TJX Companies, Inc. | — | — |
| .tk | Country Code | Telecommunication Tokelau Corporation (Teletok) | 🇹🇰Tokelau | — |
| .tkmaxx | Generic | The TJX Companies, Inc. | — | — |
| .tl | Country Code | Autoridade Nacional de Comunicações | 🇹🇱Timor-Leste | — |
| .tm | Country Code | TM Domain Registry Ltd | 🇹🇲Turkmenistan | — |