| Anr Pipeline Storage Enhancement Project | ANR Pipeline Company | | | |
| Anr Pipeline Storage Enhancement Project | ANR Pipeline Company | MI | Started 2007 | |
| Anr Pipeline coastal use permit P19971217 pipeline | ANR Pipeline Company | LA | | |
| Anr Pipeline coastal use permit P19971297 pipeline | ANR Pipeline Company | LA | | |
| Anr Pipeline coastal use permit P20110190 pipeline | ANR Pipeline Company | LA | | |
| Apache Louisiana Minerals coastal use permit P19960242 pipeline | Apache Louisiana Minerals, Inc. | LA | | |
| Apache Louisiana Minerals coastal use permit P19970235 pipeline | Apache Louisiana Minerals, Inc. | LA | | |
| Apache Louisiana Minerals coastal use permit P20030857 pipeline | Apache Louisiana Minerals, Inc. | LA | | |
| Apache coastal use permit P19971663 pipeline | Apache Corporation | LA | | |
| Apache coastal use permit P19972064 pipeline | Apache Corporation | LA | | |
| Apache coastal use permit P20090095 pipeline | Apache Corporation | LA | | |
| Apache coastal use permit P20100564 pipeline | Apache Corporation | LA | | |
| Apache coastal use permit P20120726 pipeline | Apache Corporation | LA | | |
| Apache coastal use permit P20130285 pipeline | Apache Corporation | LA | | |
| Apache coastal use permit P20180407 pipeline | Apache Corporation | LA | | |
| Apex Expansion Project | Kern River Gas Transmission Company | NV, UT, WY | In service 2011 | |
| Apollo North Pipeline Project | Will-Power Pipeline OH, LLC. | OH | | |
| Apollo South Pipeline | Will-Power Pipeline OH, LLC. | OH | | |
| Appalachia to Market II & Armagh & Entriken HP Replacement Project | Texas Eastern Transmission, LP | NJ, PA | Started 2024 | |
| Appalachia to Market III Project | Texas Eastern Transmission, LP | DE, PA | | |
| Appalachia to Market Project | Texas Eastern Transmission, LP/Appalachia to Market Project | PA | In service 2021 | |
| Appalachia-to-Texas Express (ATEX) | Enterprise Products Partners | OH, IN | In service 2014 | |
| Appalachian Gateway Project | Dominion Transmission, Inc. | PA, WV | In service 2012 | |
| Appalachian Lease Project (TEAL) Phase 1 | Texas Eastern Transmission, LP | OH | In service 2018 | |
| Appalachian Lease Project (TEAL) Phase 2 | Texas Eastern Transmission, LP | OH | In service 2019 | |
| Appalachian Reliability Project | Eastern Gas Transmission and Storage, Inc. | OH, PA | | |
| Arbuckle II Pipeline | ONEOK | OK, TX | In service 2020 | |
| Arbuckle Pipeline | | TX | | |
| Arcadia Gas Storage Pipeline Project | Arcadia Gas Storage, LLC | | | |
| Arcadia North and Arcadia South Pipelines | Arcadia Gas Storage, LLC | LA | | |