| Davis Petroleum coastal use permit P20111521 pipeline | Davis Petroleum Corp. | LA | | |
| Davis Petroleum coastal use permit P20120646 pipeline | Davis Petroleum Corp. | LA | | |
| Dearborn County Lateral Project | Texas Gas Transmission, LLC | IN, KY, OH | | |
| Decatur Lateral Project | Rockies Express Pipeline LLC | IL | | |
| Decatur Power Lateral | MidCoast Pipeline Co | AL | In service 2002 | |
| Del-Mar Energy Pathway Project | Eastern Shore Natural Gas Company | DE, MD | 2020–2021 | |
| Del-Mar Pipeline OPSB case 04-1542-GA-BTX | Del-Mar Pipeline Company, LLC | OH | | |
| Delaware Basin Extension | Sunoco Pipeline L.p. | NM, TX | In service 2016 | |
| Delaware Basin Extension Looping | West Texas LPG Pipeline Ltd. | TX | | |
| Delaware Basin North Project | Natural Gas Pipeline Company of America LLC | | | |
| Delaware Basin Pipeline | Magellan Midstream Partners LP | TX | | |
| Delaware Crossing | | TX | | |
| Delaware River Pipeline Relocation Project | Paulsboro Natural Gas Company LLC | PA | 2017 | |
| Delaware Valley Energy Expansion Project | Columbia Gas Transmission, LLC | NJ, PA | | |
| Delek Logistics - CVBSR 12" & Guidon 12" & 8" | Delek Logistics | TX | | |
| Delfin LNG Project | Delfin LNG LLC | LA | | |
| Delfin LNG coastal use permit P20150454 pipeline | Delfin LNG LLC | LA | | |
| Delfin LNG coastal use permit P20210429 pipeline | Delfin LNG LLC | LA | | |
| Delhi Compressor Station Replacement | ANR Pipeline Company | LA | | |
| Delhi Replacement | TransCanada | LA | | |
| Delmar Pipeline Extension | Suburban Natural Gas Company | OH | | |
| Delmar Regional Enhancement Project | Eastern Shore Natural Gas Company | DE, MD, PA | | |
| Delta Alliance Ditch Lowering Project | Shell Pipeline Corp | LA | | |
| Delta Blues Compressor Station | | MS | | |
| Delta CO2 Pipeline (Tinsley to Delhi extension) | Denbury Resources | MS, LA | 2008–2009 | |
| Delta Lateral Project | Kern River Gas Transmission Company | UT | 2023–2024 | |
| Delta, OH Capacity Improvement Project | Ohio Gas Company | OH | Started 2025 | |
| Demicks Lake Gas Processing Plant - McKenzie Cnty | Oneok Rockies Midstream, LLC | ND | Started 2018 | |
| Demicks Lake Gas Processing Plant - McKenzie Cnty (PU-19-358) | Oneok Rockies Midstream, LLC | ND | | |
| Demicks Lake Pipeline | WBI Energy Transmission, Inc. | ND | | |