The Mill Bridge is a structure that crosses the Kiskiminetas River between West Leechburg and Leechburg in the U.S. state of Pennsylvania.

A 1938 truss bridge, the structure carries the eponymous Mill Bridge Road between the two boroughs.

However, it is not the main access route in the area; rather it was designed for industrial purposes, as it connects central Leechburg with the Allegheny Technologies Ludlum Plant, which has long been a fixture in the area.

In 1992, the bridge was rehabilitated.