| Zhejiang Natural Gas Pipeline NetworkZhejiang → Zhejiang | China | Operating | 430 km | 9.5 bcm/y | 1 | 2017 |
| Zhejiang Natural Gas Pipeline NetworkZhejiang → Zhejiang | China | Operating | 116 km | 0.13 bcm/y | 1 | 2021 |
| Zhejiang Natural Gas Pipeline NetworkZhejiang → Zhejiang | China | Operating | 72 km | 0.6 bcm/y | 1 | 2021 |
| Zhejiang Natural Gas Pipeline NetworkZhejiang → Zhejiang | China | Proposed | 60 km | Not reported | 1 | — |
| Zhejiang Natural Gas Pipeline NetworkZhejiang → Shanghai | China | Operating | 79 km | 0.8 bcm/y | 1 | 2019 |
| Zhejiang Natural Gas Pipeline NetworkZhejiang → Zhejiang | China | Operating | 25 km | 13.5 bcm/y | 1 | 2023 |
| Zhejiang Natural Gas Pipeline NetworkZhejiang → Zhejiang | China | Operating | 33 km | 0.5 bcm/y | 1 | 2013 |
| Zhejiang Natural Gas Pipeline NetworkZhejiang → Zhejiang | China | Operating | 134 km | 0.36 bcm/y | 1 | 2015 |
| Zhejiang Natural Gas Pipeline NetworkZhejiang → Zhejiang | China | Operating | 47 km | 0.97 bcm/y | 1 | 2016 |
| Zhejiang Natural Gas Pipeline NetworkZhejiang → Zhejiang | China | Operating | 77 km | 0.16 bcm/y | 1 | 2017 |
| Zhejiang Natural Gas Pipeline NetworkZhejiang → Zhejiang | China | Under construction | 34 km | Not reported | 1 | — |
| Zhejiang Natural Gas Pipeline NetworkZhejiang → Zhejiang | China | Operating | 42 km | 0.05 bcm/y | 1 | 2021 |
| Zhejiang Natural Gas Pipeline NetworkZhejiang → Zhejiang | China | Operating | 20 km | 8 bcm/y | 1 | 2023 |
| Zhejiang Natural Gas Pipeline NetworkZhejiang → Zhejiang | China | Under construction | 34 km | 9.6 bcm/y | 1 | — |
| Zhejiang Natural Gas Pipeline NetworkZhejiang → Zhejiang | China | Proposed | 85 km | Not reported | 1 | — |
| Zhejiang Natural Gas Pipeline NetworkZhejiang → Zhejiang | China | Proposed | 30 km | 9.81 bcm/y | 1 | — |
| Zhejiang Natural Gas Pipeline NetworkZhejiang → Zhejiang | China | Operating | 54 km | 3.5 bcm/y | 1 | — |
| Zhejiang Natural Gas Pipeline NetworkZhejiang → Zhejiang | China | Operating | 37 km | Not reported | 1 | 2019 |
| Zhejiang Natural Gas Pipeline NetworkZhejiang → Zhejiang | China | Proposed | 200 km | Not reported | 1 | — |
| Zhejiang Natural Gas Pipeline NetworkZhejiang → Zhejiang | China | Proposed | 45 km | 0.1 bcm/y | 1 | — |
| Zhejiang Natural Gas Pipeline NetworkZhejiang → Zhejiang | China | Proposed | 46 km | Not reported | 1 | — |
| Zhejiang Natural Gas Pipeline NetworkZhejiang → Zhejiang | China | Proposed | 27 km | Not reported | 1 | — |
| Zhongwei-Guiyang Connecting Gas PipelineNingxia → Guizhou | China | Operating | 1,608 km | 15 bcm/y | 1 | 2012 |
| Zhongwei-Guiyang Connecting Gas PipelineGansu → Gansu | China | Operating | 94 km | 0.15 bcm/y | 1 | 2016 |
| Zhongwei-Guiyang Connecting Gas PipelineGansu → Gansu | China | Operating | 145 km | 0.2 bcm/y | 1 | 2015 |
| Zhongwei-Guiyang Connecting Gas PipelineGansu → Gansu | China | Operating | 51 km | 0.5 bcm/y | 1 | 2015 |
| Zhongxian-Wuhan Gas PipelineHubei → Hubei | China | Operating | 186 km | Not reported | 1 | 2004 |
| Zhongxian-Wuhan Gas PipelineHubei → Hunan | China | Operating | 340 km | 1.9 bcm/y | 1 | 2005 |
| Zhongxian-Wuhan Gas PipelineHubei → Hubei | China | Operating | 82 km | Not reported | 1 | 2004 |
| Zhongxian-Wuhan Gas PipelineChongqing → Hubei | China | Operating | 1,375 km | 3 bcm/y | 1 | 2004 |
| 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 |
| Zmalet El Emir AEK Gas PipelineTiaret → Tiaret | Algeria | Operating | 32 km | Not reported | 1 | 2009 |
| Zohr–Al Gamil PipelinesMediterranean Sea off shore → Port Said | Egypt | Operating | 216 km | Not reported | 1 | 2019 |
| Zohr–Al Gamil PipelinesMediterranean Sea off shore → Port Said | Egypt | Operating | 210 km | Not reported | 1 | 2017 |
| Zorkino-Balakovo Gas PipelineSaratov Oblast → Saratov Oblast | Russia | Proposed | 36 km | Not reported | 1 | 2022 |
| Zubair-Faw Gas Pipeline IraqBasrah → Al-Faw Peninsula | Iraq | Shelved | 105 km | 1.02 bcm/y | 1 | — |
| Zuideropgaande–Vlieghuis Gas Pipeline | Netherlands | Operating | 52 km | Not reported | 1 | — |
| Zurich-Chur Gas Pipeline | Switzerland | Operating | 172 km | Not reported | 1 | — |
| Zweekhorst–Paffrath Gas Pipeline | Netherlands, Germany | Operating | 20 km | Not reported | 1 | — |
| lioua Gas Pipeline | Algeria | Operating | 60 km | Not reported | 1 | 2009 |
| Šempeter-Ajdovščina Gas PipelineSlovene Littoral → Slovene Littoral | Slovenia | Proposed | 30 km | 12.3 bcm/y | 1 | 2028 |
| Škofja Loka - Ljubljana Gas Pipeline | Slovenia | Proposed | 15 km | Not reported | 1 | — |
| Šoštanj-Dravograd Gas Pipeline | Slovenia | Proposed | 24 km | Not reported | 1 | — |