| .nissay | Nippon Life Insurance Company | — |
| .nokia | Nokia Corporation | — |
| .norton | Gen Digital Inc. | — |
| .now | Amazon Registry Services, Inc. | — |
| .nowruz | Emergency Back-End Registry Operator Program - ICANN | — |
| .nowtv | Starbucks (HK) Limited | — |
| .nra | National Rifle Association of America | — |
| .nrw | Minds + Machines GmbH | — |
| .ntt | NIPPON TELEGRAPH AND TELEPHONE CORPORATION | — |
| .nyc | The City of New York by and through the New York City Department of Information Technology & Telecommunications | — |
| .obi | OBI Group Holding SE & Co. KGaA | — |
| .observer | Fegistry, LLC | — |
| .office | Microsoft Corporation | — |
| .okinawa | BRregistry, Inc. | — |
| .olayan | Competrol (Luxembourg) Sarl | — |
| .olayangroup | Competrol (Luxembourg) Sarl | — |
| .ollo | Dish DBS Corporation | — |
| .omega | The Swatch Group Ltd | — |
| .one | One.com A/S | — |
| .ong | Public Interest Registry | — |
| .onl | Jolly Host, LLC | — |
| .online | Radix Technologies Inc. SEZC | — |
| .ooo | INFIBEAM AVENUES LIMITED | — |
| .open | American Express Travel Related Services Company, Inc. | — |
| .oracle | Oracle Corporation | — |
| .orange | Orange Brand Services Limited | — |
| .org | Public Interest Registry (PIR) | — |
| .organic | Identity Digital Limited | — |
| .origins | The Estée Lauder Companies Inc. | — |
| .osaka | Osaka Registry Co., Ltd. | — |
| .otsuka | Otsuka Holdings Co., Ltd. | — |
| .ott | Dish DBS Corporation | — |
| .ovh | OVH SAS | — |
| .page | Charleston Road Registry Inc. | — |
| .panasonic | Panasonic Corporation | — |
| .paris | City of Paris | — |
| .pars | Emergency Back-End Registry Operator Program - ICANN | — |
| .partners | Binky Moon, LLC | — |
| .parts | Binky Moon, LLC | — |
| .party | Blue Sky Registry Limited | — |
| .pay | Amazon Registry Services, Inc. | — |
| .pccw | PCCW Enterprises Limited | — |
| .pet | Identity Digital Limited | — |
| .pfizer | Pfizer Inc. | — |
| .pharmacy | National Association of Boards of Pharmacy | — |
| .phd | Charleston Road Registry Inc. | — |
| .philips | Koninklijke Philips N.V. | — |
| .phone | Dish DBS Corporation | — |
| .photo | Registry Services, LLC | — |
| .photography | Binky Moon, LLC | — |