Overtoun Bridge, Category B listed road bridge in West Dunbartonshire, Scotland.

Overtoun Bridge is a Category B listed road bridge in West Dunbartonshire, Scotland, spanning Overtoun Burn with three arches. The structure displays triangular buttresses, semi-circular pedestrian recesses, and domed caps at both ends built from rough-faced ashlar.

James White bought Overtoun Farm in 1859 and built Overtoun House in 1862; after his death in 1884 his son John Campbell White inherited the estate. John Campbell White had the western approach road extended across the ravine and hired Henry Milner to design the bridge, completed in June 1895 from rough-faced ashlar.

Local stories tell of dogs that suddenly break loose and leap over the parapet, drawing the attention of behavior researchers to the site. The unexpected incidents have prompted investigations into how animals perceive scent patterns at this location.

The bridge rises roughly 50 feet above the ravine floor and allows pedestrians and vehicles to access the western approach to Overtoun House. The design includes limited side recesses, so it is advisable to watch for possible encounters with cars when crossing.

In 1994 a man with acute schizophrenia threw his two-week-old son from the bridge, believing the child was the Devil incarnate; he then tried to take his own life and was detained in a mental health hospital. He said he chose the spot for its link to dark spirits and ancient Druids.