| Corpus Christi Deep Port Channel Pipeline Replacement Project | Texas Eastern Transmission, LP | TX | Started 2021 | |
| Corpus Christi Liquefaction Midscale Trains 8 & 9 Project | Corpus Christi Liquefaction, LLC | | | |
| Corpus Christi Liquefaction Project | Cheniere Corpus Christi Pipeline | | | |
| Corpus Christi Liquefaction Stage 4 | Corpus Christi Liquefaction Stage IV, LLC | TX | | |
| Corpus Christi Pipeline | Cheniere | TX | 2017–2018 | |
| Corpus Christi Stage III & T 8-9 | Corpus Christi Liquefaction Stage III, LLC and Cheniere Corp | TX | | |
| Corpus Christi Stage III Pipeline | Cheniere Energy Corpus Christi | TX | | |
| Corridor X Project | Southern Natural Gas Company, L.L.C. | | | |
| Cosgray RD-Hayden Road Project | Columbia Gas of Ohio | OH | In service 2005 | |
| Cottonwood Bar Levee Relocation | | LA, MS | | |
| Country Gas Line | Diversified Production | WV | | |
| County Line Lateral Pipeline System | Nustar Permian Transportation And Storage, LLC | TX | | |
| Cove Mountain Road Crossing Replacement Project | Texas Eastern Transmission, LP | | | |
| Cove Point ASU Project | Dominion Cove Point LNG, LP | MD | Started 2006 | |
| Cove Point East Project | Dominion Cove Point LNG, LP | VA | In service 2005 | |
| Cove Point LNG CP23-539 | Cove Point Lng, Limited Partnership | | | |
| Cove Point LNG CPL LNG BOG Project | Cove Point Lng, Limited Partnership | | | |
| Cove Point Liquefaction Project | Dominion Cove Point LNG, LP | VA | In service 2018 | |
| Cove Point Pier Reinforcement Project | Dominion Cove Point LNG, LP | MD | | |
| Cpra coastal use permit P20200522 pipeline | Cpra | LA | | |
| Crane LP Pipeline | Antero Midstream LLC | WV | | |
| Crawford Line #3 Make Piggable Project | Natural Gas Pipeline Company of America LLC | IL | Started 2022 | |
| Creole Trail Lng, LP And Cheniere Creole Trail Pipeline coastal use permit P20051399 pipeline | Creole Trail Lng, LP And Cheniere Creole Trail Pipeline Company | LA | | |
| Creole Trail Pipeline Expansion Project | Cheniere Creole Trail Pipeline, L.P. | LA | In service 2015 | |
| Crescent City Power coastal use permit P20040638 pipeline | Crescent City Power, LLC | LA | | |
| Crescent Midstream, LLC C/o Chapman Consulting coastal use permit P20150151 pipeline | Crescent Midstream, LLC C/o Chapman Consulting, Inc. | LA | | |
| Crimson Gulf coastal use permit P20130721 pipeline | Crimson Gulf, LLC | LA | | |
| Crimson Gulf coastal use permit P20131292 pipeline | Crimson Gulf, LLC | LA | | |
| Crimson Gulf coastal use permit P20140281 pipeline | Crimson Gulf, LLC | LA | | |
| Crimson Gulf coastal use permit P20160592 pipeline | Crimson Gulf, LLC | LA | | |