复合光缆地线，或称光纤复合架空地线（Optical fiber composite overhead ground wire,OPGW）是一种利用输电线路构成的线，通常是由电力公司所使用。这种线同时达到接地及通信的目的。OPGW线包含一个管状结构内含一或多条光缆，而外围由钢及铝组成。复合光缆地线架设在超高压电塔的最顶端。其导电部份提供接地的功能，当作被雷击的保护屏障。而在内部的光缆则提供高速数据传输的功能，其数据传输可供电力系统自身保护及控制的作用，或者用来传输语音及数据，再或者可以出租给电信业者作骨干。

An optical ground wire (also known as an OPGW or, in the IEEE standard, an optical fiber composite overhead ground wire) is a type of cable that is used in the construction of electric power transmission and distribution lines. Such cable combines the functions of grounding and communications. An OPGW cable contains a tubular structure with one or more optical fibers in it, surrounded by layers of steel and aluminum wire. The OPGW cable is run between the tops of high-voltage electricity pylons. The conductive part of the cable serves to bond adjacent towers to earth ground, and shields the high-voltage conductors from lightning strikes. The optical fibers within the cable can be used for high-speed transmission of data, either for the electrical utility's own purposes of protection and control of the transmission line, for the utility's own voice and data communication, or may be leased or sold to third parties to serve as a high-speed fiber interconnection between cities.