| Northern Natural Gas Co's proposed Cunningham Service Expansion Project | Northern Natural Gas Company | KS | In service 2006 | |
| Northern Natural Gas PF13-2 | Northern Natural Gas Company | | | |
| Northern Natural Gas Project MAX | Northern Natural Gas Company | MN | In service 2003 | |
| Northern Natural Gas South Sioux City to Sioux Falls A-line Replacement Project | Northern Natural Gas Company | NE, SD | 2021–2023 | |
| Northern Supply Access Project | Texas Gas Transmission, LLC | IN, KY, LA, OH, TN | In service 2017 | |
| Northernstar Energy CP06-366 | Northernstar Energy LLC | | | |
| Northernstar Energy CP06-376 | Northernstar Energy LLC | | | |
| Northernstar Energy CP06-377 | Northernstar Energy LLC | | | |
| Northline 7 | | OK | | |
| Northstar Offshore Group coastal use permit P20110110 pipeline | Northstar Offshore Group, LLC | LA | | |
| Northstar Offshore Group coastal use permit P20131103 pipeline | Northstar Offshore Group, LLC | LA | | |
| Northwest Pipeline Acquisition and Reliability Project | Northwest Pipeline LLC | OR, WA | | |
| Northwest Pipeline CP21-115 | Northwest Pipeline LLC | CO | | |
| Northwest Pipeline CP25-211 | Northwest Pipeline LLC | | | |
| Northwest Pipeline Capacity Replacement Project | Northwest Pipeline LLC | WA | In service 2006 | |
| Northwest Pipeline PF09-10 | Northwest Pipeline LLC | | | |
| Northwest Pipeline PF11-8 | Northwest Pipeline LLC | | | |
| Northwoods Project | ANR Pipeline Company | MI, WI | | |
| NuStar Pipeline Operating Mapleton Terminal - Cass County | Nustar Pipeline Operating Partnership L.p. | ND | | |
| Nucor Pipeline | Greylock Apple Grove Pipeline LLC | WV | | |
| Nueces Crossover Pipeline | Energy Transfer Partners LP | TX | In service 2014 | |
| Nueva Era Dos Border Crossing | Nueva Era Dos, LLC | TX | | |
| Nustar Asphalt Refining coastal use permit P20100347 pipeline | Nustar Asphalt Refining, LLC | LA | | |
| Nustar Energy coastal use permit P20150900 pipeline | Nustar Energy LP | LA | | |
| Nustar Energy, LP- St. James Terminal coastal use permit P20180292 pipeline | Nustar Energy, LP- St. James Terminal | LA | | |
| Nustar Logistics coastal use permit P20081402 pipeline | Nustar Logistics, L.p. | LA | | |
| Nustar Logistics coastal use permit P20091101 pipeline | Nustar Logistics, L.p. | LA | | |
| Nustar Logistics coastal use permit P20110499 pipeline | Nustar Logistics, L.p. | LA | | |
| Nustar Logistics coastal use permit P20190534 pipeline | Nustar Logistics, L.p. | LA | | |
| Nustar Logistics coastal use permit P20200085 pipeline | Nustar Logistics, L.p. | LA | | |