运渡桥是一种活动桥，桥下悬挂可沿桥移动的用于渡河的平台或车厢，平台或车厢往返于桥两端的渡口，以接送路人和车辆。这种设计可方便船只穿过横跨通航水道的桥。世上现存的运渡桥数目很少。

世界上第一条运渡桥是位于西班牙波尔图加莱特（Portugalete）的比斯开桥，建于1893年。由于运渡桥负载量有限，当汽车兴起后，运渡桥的概念就日趋式微。

A transporter bridge, also known as a ferry bridge or aerial transfer bridge, is a type of movable bridge that carries a segment of roadway across a river. The gondola is slung from a tall span by wires or a metal frame. The design has been used to cross navigable rivers or other bodies of water, where there is a requirement for ship traffic to be able to pass. This has been a rare type of bridge, with fewer than two dozen built. There are just twelve that continue to be used today, including one converted into a lift bridge and one designed as, but not yet operating as, a transporter bridge.