人行过街天桥是现代化都市中协助行人穿过道路的一种建筑，修建过街天桥可以使穿越道路的行人和道路上的车辆实现完全的分离，保证交通的通畅和行人的安全。最常见的人行过街天桥是跨越街道或公路的，也有跨越铁路、轻轨的过街天桥，另外还有一些过街天桥修建在立体交叉路口，与立交桥的建筑融为一体。在香港中环的中区行人天桥系统及**的信义商圈空桥系统，人们将各个过街天桥用廊道链接在一起，形成了一个四通八达的空中人行交通网，成为城市的象征。

A footbridge (also called a pedestrian bridge, pedestrian overpass, or pedestrian overcrossing) is a bridge designed for pedestrians and in some cases cyclists, animal traffic, and horse riders, instead of vehicular traffic. Footbridges complement the landscape and can be used decoratively to visually link two distinct areas or to signal a transaction. In many developed countries, footbridges are both functional and can be beautiful works of art and sculpture. For poor rural communities in the developing world, a footbridge may be a community's only access to medical clinics, schools and markets, which would otherwise be unreachable when rivers are too high to cross. Simple suspension bridge designs have been developed to be sustainable and easily constructible in such rural areas using only local materials and labor.