| .om | Country Code | Telecommunications Regulatory Authority (TRA) | 🇴🇲Oman | — |
| .omega | Generic | The Swatch Group Ltd | — | — |
| .one | Generic | One.com A/S | — | — |
| .ong | Generic | Public Interest Registry | — | — |
| .onl | Generic | Jolly Host, LLC | — | — |
| .online | Generic | Radix Technologies Inc. SEZC | — | — |
| .ooo | Generic | INFIBEAM AVENUES LIMITED | — | — |
| .open | Generic | American Express Travel Related Services Company, Inc. | — | — |
| .oracle | Generic | Oracle Corporation | — | — |
| .orange | Generic | Orange Brand Services Limited | — | — |
| .org | Generic | Public Interest Registry (PIR) | — | — |
| .organic | Generic | Identity Digital Limited | — | — |
| .origins | Generic | The Estée Lauder Companies Inc. | — | — |
| .osaka | Generic | Osaka Registry Co., Ltd. | — | — |
| .otsuka | Generic | Otsuka Holdings Co., Ltd. | — | — |
| .ott | Generic | Dish DBS Corporation | — | — |
| .ovh | Generic | OVH SAS | — | — |
| .pa | Country Code | Universidad Tecnologica de Panama | 🇵🇦Panama | — |
| .page | Generic | Charleston Road Registry Inc. | — | — |
| .panasonic | Generic | Panasonic Corporation | — | — |
| .paris | Generic | City of Paris | — | — |
| .pars | Generic | Emergency Back-End Registry Operator Program - ICANN | — | — |
| .partners | Generic | Binky Moon, LLC | — | — |
| .parts | Generic | Binky Moon, LLC | — | — |
| .party | Generic | Blue Sky Registry Limited | — | — |
| .pay | Generic | Amazon Registry Services, Inc. | — | — |
| .pccw | Generic | PCCW Enterprises Limited | — | — |
| .pe | Country Code | Red Cientifica Peruana | 🇵🇪Peru | — |
| .pet | Generic | Identity Digital Limited | — | — |
| .pf | Country Code | Gouvernement de la Polynésie française | 🇵🇫French Polynesia | — |
| .pfizer | Generic | Pfizer Inc. | — | — |
| .pg | Country Code | PNG DNS Administration, Vice Chancellors Office, The Papua New Guinea University of Technology | 🇵🇬Papua New Guinea | — |
| .ph | Country Code | PH Domain Foundation | 🇵🇭Philippines | — |
| .pharmacy | Generic | National Association of Boards of Pharmacy | — | — |
| .phd | Generic | Charleston Road Registry Inc. | — | — |
| .philips | Generic | Koninklijke Philips N.V. | — | — |
| .phone | Generic | Dish DBS Corporation | — | — |
| .photo | Generic | Registry Services, LLC | — | — |
| .photography | Generic | Binky Moon, LLC | — | — |
| .photos | Generic | Binky Moon, LLC | — | — |
| .physio | Generic | PhysBiz Pty Ltd | — | — |
| .pics | Generic | XYZ.COM LLC | — | — |
| .pictet | Generic | Banque Pictet & Cie SA | — | — |
| .pictures | Generic | Binky Moon, LLC | — | — |
| .pid | Generic | Top Level Spectrum, Inc. | — | — |
| .pin | Generic | Amazon Registry Services, Inc. | — | — |
| .ping | Generic | Ping Registry Provider, Inc. | — | — |
| .pink | Generic | Identity Digital Limited | — | — |
| .pioneer | Generic | Pioneer Corporation | — | — |
| .pizza | Generic | Binky Moon, LLC | — | — |