| Castex Energy coastal use permit P20130008 pipeline | Castex Energy, Inc. | LA | | |
| Castex Energy coastal use permit P20130874 pipeline | Castex Energy, Inc. | LA | | |
| Castex Energy coastal use permit P20141198 pipeline | Castex Energy, Inc. | LA | | |
| Castle Black to Rover Pipeline | Eqt XL Midstream Operating LLC | WV | | |
| Cavern 12A Conversion Project | Petal Gas Storage, L.L.C | MS | Started 2012 | |
| Cavern 24 Expansion Project | PetroLogistics Natural Gas Storage | LA | | |
| Cavern Well Relocation Project | Leaf River Energy Center LLC | | Started 2011 | |
| Cayenne Pipeline coastal use permit P20230124 pipeline | Cayenne Pipeline, LLC | LA | | |
| Ce FLNG PF13-11 | Ce FLNG | | | |
| Cecil County Expansion | Eastern Shore Natural Gas Company | DE, MD | In service 2012 | |
| Cedar Bayou Lateral Project | Texas Eastern Transmission, LP | TX | 2008 | |
| Cedar Creek Anticline CO2 Pipeline | Denbury | MT | In service 2021 | |
| Cedar Springs Class Replacement Project | Columbia Gas Transmission, LLC | VA | Started 2023 | |
| Cedar Station Upgrade Project | Northern Natural Gas Company | MN | In service 2018 | |
| Cedar Vale Compressor Station Project | Southern Star Central Gas Pipeline, Inc. | OK | Started 2026 | |
| Cedar to Grays Peak | | WV | | |
| Celestine Compressor Station Replacement | ANR Pipeline Company | IN | | |
| Cemex-Morris Bean, Z50 Pipeline Replacement Project | Vectren Energy Delivery Of Ohio | OH | | |
| Cenex Pipeline Amend Certificate #202 and Route Permit #212 | Cenex Pipeline LLC | ND | | |
| Cenex Pipeline Replacement | Cenex Pipeline LLC | MT, ND | | |
| Cenex Prosper Terminal Project - Cass County | Cenex Pipeline LLC | ND | | |
| Centana Phase I, Phase II | Centana Energy Corp. | LA | In service 1996 | |
| CenterPoint Energy Gas Transmission CP07-434 | Centerpoint Energy Gas Transmission | | In service 2007 | |
| CenterPoint Energy Gas Transmission PF13-10 | Centerpoint Energy Gas Transmission | | | |
| CenterPoint Intermodal Facility Pipe Relocation Project | ANR Pipeline Company | IL | | |
| Central Arkansas Pipeline Enhancement Project | Enable Gas Transmission, LLC | AR | | |
| Central Columbus North Columbus High Pressure (NCHP) System Project | Columbia Gas of Ohio | OH | | |
| Central Corridor Pipeline Extension | Duke Energy Ohio | OH | In service 2022 | |
| Central Crude coastal use permit P20120956 pipeline | Central Crude Inc | LA | | |
| Central Mainline Corridor Expansion Project | Northern Natural Gas Company | IA, NE | | |