| Cadiz to DEO | | OH | | |
| Calcasieu Pass LNG Terminal | Venture Global Calcasieu Pass, LLC | LA | In service 2025 | |
| Calcasieu Pass LNG Up-Rate Project | Venture Global Calcasieu Pass, LLC | | | |
| Caledonia Expansion Project | Caledonia Energy Partners, LLC | MS | | |
| Caledonia Storage Project | Caledonia Energy Partners, LLC | MS | | |
| Caliber Bear Den Interconnect Pipeline | Caliber Midstream Partners, L.P. | ND | | |
| California Action Project | Kern River Gas Transmission Company | CA, NV, UT, WY | In service 2001 | |
| Callon Offshore Prod coastal use permit P19961878 pipeline | Callon Offshore Prod | LA | | |
| Calumet Integrity Project | Natural Gas Pipeline Company of America LLC | IL | | |
| Calypso Pipeline Project (LNG/Bhms | Calypso U.S. Pipeline, LLC | FL | | |
| Cameron Access Project | Columbia Gulf Transmission, LLC | LA | In service 2018 | |
| Cameron Extension Project | Texas Eastern Transmission, LP/Cameron Extension Project | LA | In service 2021 | |
| Cameron Highway Pipeline - Texas City Route | | TX | | |
| Cameron Interstate Pipeline | Sempra | LA | 2007–2008 | |
| Cameron Interstate Pipeline CP16-76 | Cameron Interstate Pipeline, LLC | LA | | |
| Cameron Interstate Pipeline Expansion Project | Cameron Interstate Pipeline, LLC | LA | In service 2017 | |
| Cameron LNG BOG Liquefaction Project | Cameron Lng, LLC | LA | Started 2012 | |
| Cameron LNG Liquefaction Project | Cameron Lng, LLC | | | |
| Cameron LNG Terminal coastal use permit P20020932 pipeline | Cameron LNG Terminal, LLC | LA | | |
| Cameron LNG Train 4 | Cameron Lng, LLC | LA | | |
| Cameron Ridge to Mobley | | WV | | |
| Cameron Terminal Expansion Project | Cameron Lng, LLC | | | |
| Cana STACK Expansion Project | Enable Gas Transmission, LLC | OK | In service 2018 | |
| Cane Hill Project | Regency Intrastate Gas LP | LA | In service 2011 | |
| Cannon Falls NG Pipeline Project | Greater Minnesota Transmission | MN | In service 2008 | |
| Cantium coastal use permit P20000818 pipeline | Cantium. LLC | LA | | |
| Cantium coastal use permit P20110028 pipeline | Cantium. LLC | LA | | |
| Cantium coastal use permit P20110167 pipeline | Cantium. LLC | LA | | |
| Cantium coastal use permit P20110777 pipeline | Cantium. LLC | LA | | |
| Cantium coastal use permit P20111064 pipeline | Cantium. LLC | LA | | |