Blackfriars Street Bridge, Wrought iron bowstring arch bridge in London, Canada

Blackfriars Street Bridge is a single-span wrought iron bowstring arch through truss over the North Thames River in London, Ontario, carrying Blackfriars Street across to Ridout Street North. Its two green-painted arched top chords rise above a flat grey deck edged with low green railings, and the framework of vertical and diagonal members is joined by pin connections and lattice girders. The span rests on three grey concrete piers.

The bridge was built in 1875 by the Wrought Iron Bridge Company from Canton, Ohio, replacing earlier wooden crossings that had stood at this spot since 1831. It was later restored and reopened in December 2018 after extensive work.

The bridge appears in visual and literary works, including a series of stained glass windows by London artist Ted Goodden. The crossing also marks the northernmost of eight bridges of different ages and types around the confluence of the North Thames and Thames rivers, the historic centre of London.

The bridge is open to pedestrians, cyclists, and vehicles, but the crossing is narrow, so extra care is needed when multiple users are present at the same time. Visiting during quieter times of day makes it easier to take in the metal structure without distractions.

The bridge's deck rests on modest granite abutments at the very tips of its arch, so from many profile views along both banks it appears to float above the North Thames. Its bottom chord is made of wrought-iron eyebars running outside the deck on both sides.