| Adriatica PipelineMolise → Abruzzo | Italy | Operating | 94 km | 8.8 bcm/y | 1 | 2005 |
| Adriatica Pipeline | Italy | Under construction | 140 km | 1.83 bcm/y | 1 | 2026 |
| Adriatica PipelineApulia → Apulia | Italy | Operating | 195 km | 8.8 bcm/y | 1 | 2012 |
| Adriatica PipelineApulia → Molise | Italy | Operating | 73 km | 8.8 bcm/y | 1 | 2016 |
| Adriatica PipelineAbruzzo → Umbria | Italy | Proposed | 170 km | 6.94 bcm/y | 1 | 2027 |
| Adriatica Pipeline | Italy | Proposed | 114 km | 6.94 bcm/y | 1 | 2027 |
| Alessandria–Cortemaggiore Gas Pipeline | Italy | Operating | 118 km | Not reported | 1 | 1986 |
| Altamura–Candela Gas Pipeline | Italy | Operating | 110 km | Not reported | 1 | 1967 |
| Altamura–Ferrandina Gas Pipeline | Italy | Operating | 30 km | Not reported | 1 | 1987 |
| Altamura–Latiano Gas Pipeline | Italy | Operating | 144 km | Not reported | 1 | 1990 |
| Altamura–Latiano Gas Pipeline | Italy | Operating | 144 km | Not reported | 1 | 1990 |
| Benevento–Biccari Gas Pipeline | Italy | Operating | 53 km | Not reported | 1 | 1965 |
| Bernalda-Brindisi Gas Pipeline | Italy | Operating | 112 km | Not reported | 1 | 2000 |
| Bernalda–Grumento Gas Pipeline | Italy | Operating | 91 km | Not reported | 1 | 1993 |
| Biccari–Candela Gas Pipeline | Italy | Operating | 36 km | Not reported | 1 | 1965 |
| Biccari–Massafra Gas Pipeline | Italy | Operating | 195 km | Not reported | 1 | 2011 |
| Buccino-Contrada-Melizzano Gas Pipeline | Italy | Operating | 138 km | Not reported | 1 | 1996 |
| Calderari Enna–Gela Gas Pipeline | Italy | Operating | 67 km | Not reported | 1 | 2004 |
| Caldonazzo-Trento Gas Pipeline | Italy | Operating | 17 km | Not reported | 1 | 1984 |
| Camisano-Zimella Gas Pipeline | Italy | Operating | 41 km | Not reported | 1 | 1974 |
| Campagna Lupia–Ravenna Gas Pipeline | Italy | Operating | 109 km | Not reported | 1 | 1969 |
| Canicatti–Enna Gas Pipeline | Italy | Operating | 60 km | Not reported | 1 | 1995 |
| Cavarzere-Minerbio Gas Pipeline | Italy | Operating | 83 km | Not reported | 1 | 2008 |
| Celleno-Cetona Gas Pipeline | Italy | Operating | 59 km | Not reported | 1 | 1994 |
| Celleno-Gallese Gas Pipeline | Italy | Operating | 35 km | Not reported | 1 | 1993 |
| Cervignano-Rognano Gas Pipeline | Italy | Operating | 32 km | Not reported | 1 | 1994 |
| Cervignano–Ripalta Gas Pipeline | Italy | Operating | 22 km | Not reported | 1 | 1996 |
| Cetona-Terranuova Gas Pipeline | Italy | Operating | 76 km | Not reported | 1 | 1994 |
| Chieti–Pineto Gas Pipeline | Italy | Operating | 28 km | Not reported | 1 | — |
| Chieti–San Salvo Gas Pipeline | Italy | Operating | 94 km | Not reported | 1 | 1981 |
| Chivasso–Mortara Gas Pipeline | Italy | Operating | 68 km | Not reported | 1 | 1994 |
| Chivasso–Poirino Gas Pipeline | Italy | Operating | 32 km | Not reported | 1 | 1987 |
| Cortemaggiore–Pontremoli Gas Pipeline | Italy | Operating | 43 km | Not reported | 1 | 1981 |
| Cortemaggiore–Pontremoli Gas Pipeline | Italy | Operating | 107 km | Not reported | 1 | 2026 |
| Cortemaggiore–Ripalta Gas Pipeline | Italy | Operating | 43 km | Not reported | 1 | 1981 |
| Crotone–Maida Santa Eufemia Gas Pipeline | Italy | Operating | 98 km | Not reported | 1 | 1975 |
| Eagle FLNG Pipeline | Albania, Italy | Cancelled | 128 km | 10 bcm/y | 1 | 2017 |
| Enna-Bronte Gas Pipeline | Italy | Operating | 66 km | Not reported | 1 | 1993 |
| Enna-Montalbano Gas Pipeline | Italy | Operating | 87 km | Not reported | 1 | 2005 |
| FSRU Ravenna Gas Pipeline | Italy | Operating | 31 km | 7.95 bcm/y | 1 | 2025 |
| FSRU Ravenna Gas Pipeline | Italy | Operating | 10 km | 7.95 bcm/y | 1 | 2025 |
| Ferrandina–Moliterno Gas Pipeline | Italy | Operating | 83 km | Not reported | 1 | 1984 |
| Flaibano-Gonars-Villesse Gas Pipeline | Italy | Operating | 47 km | Not reported | 1 | 1991 |
| Foligno-Terni-Civita Castellana Gas Pipeline | Italy | Operating | 62 km | Not reported | 1 | 1972 |
| GALSI PipelineLaghouat → Tuscany | Algeria, Italy | Shelved | 861 km | 8 bcm/y | 1 | — |
| Gagliano-Messina Gas Pipeline | Italy | Operating | 130 km | Not reported | 1 | 1980 |
| Gallese Civita Cast–Oricola Gas Pipeline | Italy | Operating | 82 km | Not reported | 1 | 1994 |
| Greece-Italy Interconnector Gas Pipeline | Greece, Italy | Operating | 800 km | Not reported | 1 | 2010 |
| Greenstream Gas Pipeline | Libya, Italy | Operating | 520 km | 0.2 bcm/y | 1 | 2004 |
| Istrana-Caldonazzo Gas Pipeline | Italy | Operating | 110 km | Not reported | 1 | 1989 |
| Istrana–Mira Gas Pipeline | Italy | Operating | 30 km | Not reported | 1 | 1978 |
| Larino-Chieti Gas PipelineCampobasso → Pescara | Italy | Operating | 113 km | 2.53 bcm/y | 1 | 2022 |
| Larino-Sora-Colleferro Gas Pipeline | Italy | Under construction | 12 km | Not reported | 1 | — |
| Lauria-Tarsia Gas Pipeline | Italy | Operating | 69 km | Not reported | 1 | 1994 |
| Lauria–Montesano Gas Pipeline | Italy | Operating | 38 km | Not reported | 1 | 1995 |
| Lucera-San Paolo Gas Pipeline | Italy | Under construction | 69 km | Not reported | 1 | 2025 |
| Maenza-Gallese Gas Pipeline | Italy | Operating | 127 km | Not reported | 1 | 1983 |
| Maenza–Melizzano Gas Pipeline | Italy | Operating | 133 km | Not reported | 1 | 1982 |
| Maida Saint Eufemia-Castrovillari Gas PIpeline | Italy | Operating | 102 km | Not reported | 1 | 1981 |
| Maida-Martirano Gas Pipeline | Italy | Operating | 34 km | Not reported | 1 | 1993 |
| MaidaSEufemia–Reggio Calabria Gas Pipeline | Italy | Operating | 96 km | Not reported | 1 | 1980 |
| Malborghetto-Camisano Gas Pipeline | Italy | Operating | 163 km | Not reported | 1 | 1973 |
| Malborghetto-Flaibano Gas Pipeline | Italy | Operating | 77 km | Not reported | 1 | 2002 |
| Malborghetto-Flaibano Gas Pipeline | Italy | Operating | 38 km | Not reported | 1 | 2026 |
| Malta-Italy Gas Pipeline | Italy, Malta | Proposed | 159 km | 1.2 bcm/y | 1 | 2030 |
| Masera–Mortara Gas Pipeline | Italy | Operating | 125 km | Not reported | 1 | 1972 |
| Masera–Mortara Gas Pipeline | Italy | Operating | 0 km | Not reported | 1 | 2001 |
| Matagiola-Massafra Gas PipelineTaranto → Apulia | Italy | Proposed | 40 km | 3.61 bcm/y | 1 | 2030 |
| Mazara Del Vallo-Sciacca Gas Pipeline | Italy | Operating | 50 km | Not reported | 1 | 1980 |
| Mazara del Vallo-Gagliano Gas Pipeline | Italy | Operating | 224 km | Not reported | 1 | 1980 |
| Mazara del Vallo-Menfi Gas Pipeline | Italy | Operating | 43 km | Not reported | 1 | 2008 |
| Melizzano-Castrovillari Gas Pipeline | Italy | Operating | 286 km | Not reported | 1 | 1981 |
| Melizzano-Vastogirardi Gas Pipeline | Italy | Operating | 89 km | Not reported | 1 | 1993 |
| Melizzano-Vastogirardi Gas Pipeline | Italy | Operating | 89 km | Not reported | 1 | 1993 |
| Melizzano–Benevento Gas Pipeline | Italy | Operating | 37 km | Not reported | 1 | 1968 |
| Messina–Montalbano Gas Pipeline | Italy | Operating | 77 km | Not reported | 1 | 1996 |
| Methanization of Sardinia Project | Italy | Proposed | 420 km | 1.68 bcm/y | 1 | 2027 |
| Methanization of Sardinia Project | Italy | Proposed | 260 km | 1.68 bcm/y | 1 | 2030 |
| Minerbio-Castelbolognese Gas Pipeline | Italy | Operating | 44 km | Not reported | 1 | 1993 |
| Minerbio-Zimella Gas Pipeline | Italy | Operating | 86 km | Not reported | 1 | 1980 |
| Minerbio–Parma Gas Pipeline | Italy | Operating | 39 km | Not reported | 1 | 1992 |
| Minerbio–Parma Gas Pipeline | Italy | Operating | 81 km | Not reported | 1 | 1994 |
| Minerbio–Ravenna Terra Gas Pipeline | Italy | Operating | 59 km | Not reported | 1 | 1969 |
| Mira–Campagna Lupia Gas Pipeline | Italy | Operating | 14 km | Not reported | 1 | 1992 |
| Moliterno–Montesano Sulla Marcellana Gas Pipeline | Italy | Operating | 5.1 km | Not reported | 1 | — |
| Montalbano-Messina Gas Pipeline | Italy | Operating | 79 km | Not reported | 1 | 1996 |
| Montalbano–Bronte Gas Pipeline | Italy | Operating | 60 km | Not reported | 1 | 1995 |
| Montesano-Buccino Gas Pipeline | Italy | Operating | 57 km | Not reported | 1 | 1993 |
| Morano–Tarsia Gas Pipeline | Italy | Operating | 42 km | Not reported | 1 | 2008 |
| Mortara–Alessandria Gas Pipeline | Italy | Operating | 44 km | Not reported | 1 | 2008 |
| Mortara–Alessandria Gas Pipeline | Italy | Operating | 0 km | Not reported | 1 | 2008 |
| Oricola–Ciciliano Gas Pipeline | Italy | Operating | 18 km | Not reported | 1 | 1984 |
| Oricola–Ciciliano Gas Pipeline | Italy | Operating | 18 km | Not reported | 1 | 1993 |
| Palagiano-Brindisi Gas Pipeline | Italy | Operating | 77 km | Not reported | 1 | 1984 |
| Palagiano-Brindisi Gas Pipeline | Italy | Operating | 77 km | Not reported | 1 | 1985 |
| Palagiano–Bernalda Gas Pipeline | Italy | Operating | 33 km | Not reported | 1 | 1975 |
| Palmi-Maida Gas Pipeline | Italy | Operating | 77 km | Not reported | 1 | 1995 |
| Palmi-Martirano Gas Pipeline | Italy | Operating | 113 km | Not reported | 1 | 2004 |
| Palmi–Messina Gas Pipeline | Italy | Operating | 32 km | Not reported | 1 | — |
| Parma-Cortemaggiore Gas Pipeline | Italy | Operating | 43 km | Not reported | 1 | 1995 |
| Parma–Pontremoli Gas Pipeline | Italy | Operating | 71 km | Not reported | 1 | 2002 |
| Passo Gries-Masera Gas Pipeline | Italy | Operating | 42 km | Not reported | 1 | 1998 |
| Persian Gas Pipeline | Iran, Türkiye, Greece, Italy, Switzerland, Austria, Germany, France, Spain | Cancelled | 3,300 km | 40 bcm/y | 1 | — |
| Poggio Renatico-Cortemaggiore Gas Pipeline | Italy | Operating | 139 km | Not reported | 1 | 1985 |
| Poggio Renatico–Minerbio Gas Pipeline | Italy | Operating | 19 km | Not reported | 1 | 1988 |
| Poggio Renatico–Minerbio Gas Pipeline | Italy | Operating | 0 km | Not reported | 1 | 2015 |
| Poirino–Alessandria Gas Pipeline | Italy | Operating | 66 km | Not reported | 1 | 1971 |
| Pontremoli–La Spezia Gas Pipeline | Italy | Operating | 19 km | Not reported | 1 | 1969 |
| Pontremoli–La Spezia Gas Pipeline | Italy | Operating | 43 km | Not reported | 1 | 2026 |
| Pordenone-Istrana Gas Pipeline | Italy | Operating | 61 km | Not reported | 1 | 1999 |
| Poseidon Gas Pipeline | Greece, Italy | Proposed | 210 km | 12 bcm/y | 1 | 2027 |
| Poseidon Gas Pipeline | Greece, Italy | Proposed | 760 km | 12 bcm/y | 1 | — |
| Poseidon Gas Pipeline | Greece, Italy | Proposed | 0 km | 8 bcm/y | 1 | — |
| Ravenna-Recanati Gas Pipeline | Italy | Operating | 172 km | Not reported | 1 | 1960 |
| Recanati–Chieti Gas Pipeline | Italy | Operating | 150 km | Not reported | 1 | 1960 |
| Recanati–Foligno Gas Pipeline | Italy | Operating | 100 km | Not reported | 1 | 1971 |
| Reggio Calabria–Messina Gas Pipeline | Italy | Operating | 19 km | Not reported | 1 | — |
| Rimini–Sansepolcro Gas Pipeline | Italy | Operating | 46 km | Not reported | 1 | 1970 |
| Rimini–Sansepolcro Gas Pipeline | Italy | Cancelled | 0 km | Not reported | 1 | 2023 |
| Ripalta–Sergnano Gas Pipeline | Italy | Operating | 16 km | Not reported | 1 | 1980 |
| Rogatec–Gorizia Gas Pipeline | Slovenia, Italy | Operating | 101 km | 2.71 bcm/y | 1 | — |
| Rognano-Mortara Gas Pipeline | Italy | Operating | 26 km | Not reported | 1 | 1995 |
| Saint Stefano Di Magra-Cortemaggiore Gas Pipline | Italy | Operating | 122 km | Not reported | 1 | 1967 |
| San Marco–Recanati PipelineFermo → Macerata | Italy | Operating | 35 km | 2.53 bcm/y | 1 | 2022 |
| San Salvo–Biccari Gas Pipeline | Italy | Operating | 94 km | Not reported | 1 | 1981 |
| San Salvo–Vastogirardi Gas Pipeline | Italy | Operating | 58 km | Not reported | 1 | — |
| Sansepolcro-Terranuova Gas Pipeline | Italy | Operating | 46 km | Not reported | 1 | 1970 |
| Sciacca-Canicatti Gas Pipeline | Italy | Operating | 82 km | Not reported | 1 | 1992 |
| Sealine Tirrenica Gas Pipeline | Italy | Cancelled | 255 km | Not reported | 1 | 2034 |
| Sergnano-Mortara Gas Pipeline | Italy | Operating | 57 km | Not reported | 1 | 1970 |
| Sergnano–Vigasio Gas Pipeline | Italy | Operating | 81 km | Not reported | 1 | — |
| South Stream Gas PipelineKrasnodar Krai → Udine and Lower Austria | Russia, Bulgaria, Serbia, Hungary, Croatia, Slovakia, Slovenia, Austria, Greece, Italy | Cancelled | 2,380 km | 63 bcm/y | 1 | — |
| Spain-Italy Offshore Interconnector | Spain, Italy | Shelved | 700 km | 30 bcm/y | 1 | — |
| TAP Interconnection Gas PipelineApulia → Apulia | Italy | Operating | 55 km | Not reported | 1 | 2020 |
| Tarsia–Crotone Gas Pipeline | Italy | Operating | 129 km | Not reported | 1 | 1976 |
| Tarsia–Rende Gas Pipeline | Italy | Operating | 33 km | Not reported | 1 | 2009 |
| Tarvisio-Malborghetto Gas Pipeline | Italy | Operating | 23 km | Not reported | 1 | 2008 |
| Tarvisio-Zimella Gas Pipeline | Italy | Operating | 265 km | Not reported | 1 | 1987 |
| Tauern Gas PipelineBayern → Friuli Venezia Giulia | Germany, Austria, Italy | Cancelled | 290 km | 11.4 bcm/y | 1 | — |
| Terranuova Bracciolini–Gallese Civita Cast Gas Pipeline | Italy | Operating | 169 km | Not reported | 1 | 1993 |
| Terranuova Bracciolini–Livorno Gas Pipeline | Italy | Operating | 114 km | Not reported | 1 | — |
| Terranuova-Castelbolognese Gas Pipeline | Italy | Operating | 112 km | Not reported | 1 | 1996 |
| Terranuova-Minerbio Gas Pipeline | Italy | Operating | 156 km | Not reported | 1 | 1984 |
| Trans-Adriatic Gas Pipeline | Türkiye, Greece, Albania, Italy | Operating | 878 km | 10 bcm/y | 1 | 2020 |
| Trans-Adriatic Gas Pipeline | Türkiye, Greece, Albania, Italy | Proposed | 0 km | 10 bcm/y | 1 | 2025 |
| Trans-Mediterranean Gas PipelineLaghouat → Slovenia | Algeria, Tunisia, Italy, Croatia | Operating | 3,579 km | 33.5 bcm/y | 1 | 1983 |
| Trans-Mediterranean Gas PipelineCap Bon → Mediterranean | Tunisia, Italy | Operating | 155 km | Not reported | 1 | — |
| Trans-Mediterranean Gas PipelineMediterranean → Strait of Messina | Italy | Operating | 355 km | Not reported | 1 | — |
| Upper Tyrrhenian Sea Gas Pipeline | Italy | Proposed | 35 km | Not reported | 1 | 2026 |
| Vastogirardi-Oricola Gas Pipeline | Italy | Operating | 139 km | Not reported | 1 | 1993 |
| Vastogirardi-Oricola Gas Pipeline | Italy | Operating | 139 km | Not reported | 1 | — |
| Veruno-Bizzarone Gas Pipeline | Italy | Operating | 48 km | Not reported | 1 | 1976 |
| Vigasio–Trento Gas Pipeline | Italy | Operating | 94 km | Not reported | 1 | 1973 |
| Villesse-Gorizia Gas Pipeline | Italy | Operating | 19 km | Not reported | 1 | 2010 |
| Zimella-Cervignano Gas Pipeline | Italy | Operating | 172 km | Not reported | 1 | 2014 |
| Zimella–Istrana Gas Pipeline | Italy | Operating | 70 km | Not reported | 1 | — |
| Zimella–Poggio Renatico Gas Pipeline | Italy | Operating | 66 km | Not reported | 1 | 2000 |
| Zimella–Poggio Renatico Gas Pipeline | Italy | Proposed | 65 km | 8.03 bcm/y | 1 | 2031 |