乙太網供電（Power over Ethernet，簡稱PoE）也稱PoE供電，是一種可以在乙太網路中透過雙絞線來傳輸電力與資料到裝置上的技術。透過這項技術可使包括網路電話、無線基地台、網路攝影機、集線器、電腦等裝置都能採用PoE技術供電。由於能藉由乙太網路獲得供電的電子裝置無需額外的電源插座就可使用，所以同時能省去配置電源線的時間與金錢，使整個裝置系統的成本相對降低。而目前全球均普遍採用RJ-45網路插座，因此各種PoE裝置都具備相容性。PoE不需要更改乙太網路的纜線架構即可運作，所以採用PoE系統不但節省成本易於布線安裝還具備了遠程通電、斷電的能力。
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