| Niles Power Plant Meter Station Project | ANR Pipeline Company | MI | In service 2022 | |
| Nine Mile Project | Gulf South Pipeline Company, LLC | LA | | |
| Ninilchik Pipeline | Kenai Kachemak Pipeline LLC | AK | In service 2003 | |
| Nippon Oil Exploration USA coastal use permit P20070923 pipeline | Nippon Oil Exploration USA Limited | LA | | |
| Nisource OPSB case 06-0020-GA-BLN | Nisource Inc | OH | | |
| No. 10 Kent Compressor Station (GTN XPress Project) | Gas Transmission Northwest LLC | OR | In service 2024 | |
| No. 5 Athol Compressor Station (GTN XPress Project) | Gas Transmission Northwest LLC | ID | In service 2024 | |
| No. 7 Starbuck Compressor Station (GTN XPress Project) | Gas Transmission Northwest LLC | WA | 2024 | |
| Noble Energy coastal use permit P20061459 pipeline | Noble Energy Inc | LA | | |
| Noble Midstream - Billie Minor System | | TX | | |
| Noble Midstream - Coronado Gathering System | | TX | | |
| Norco-Garyville Pipeline Expansion | Sorrento Pipeline Company, Llc, A Texas Limited Liability Company | LA | | |
| Norte Crossing Project | El Paso Natural Gas Company, L.L.C. | TX | In service 2013 | |
| North Baja Pipeline LNG Expansion Project (Phase I | North Baja Pipeline, LLC | AZ, CA | In service 2008 | |
| North Baja Pipeline Proj (US Portion) | North Baja Pipeline, LLC | AZ, CA | In service 2002 | |
| North Baja XPress Project | North Baja Pipeline, LLC | AZ, CA | In service 2023 | |
| North Baja Yuma Lateral | North Baja Pipeline, LLC | AZ | In service 2010 | |
| North Bakken Expansion Project | WBI Energy Transmission, Inc./North Bakken Expansion Project Amendment | ND | 2021–2022 | |
| North Branch Compressor Station Project | Northern Natural Gas Company | MN | | |
| North Canton Connector Pipeline | Antero Midstream LLC | WV | | |
| North Carolina Mainline B Pipeline Replacement Project | Transcontinental Gas Pipe Line Company, LLC | | | |
| North Carolina Natural Gas Clayton Compressor Station | | NC | | |
| North Coast Gas Transmission OPSB case 14-1754-GA-BLN | North Coast Gas Transmission, LLC | OH | | |
| North Dakota Natural Gas Pipeline Project | Hess Tioga Gas Plant LLC | ND | | |
| North Elko Pipeline Project | Prospector Pipeline | NV | In service 2013 | |
| North Extension Project | Natural Gas Pipeline Company of America LLC | IA, IL, WI | | |
| North Field Services 16-inch Pipeline | Energy Transfer | PA | | |
| North Fork Nooksack Line Lowering Project | Northwest Pipeline LLC | WA | In service 2019 | |
| North Fork Pipeline | Anchor Point Energy LLC | AK | 2010–2011 | |
| North Hofflund Valve Site Tie-In | Hess North Dakota Pipelines LLC | ND | | |