Four Mile Bridge (Welsh: Pontrhydybont / Pont-rhydbont / Pontrhypont) is a village spanning both sides of the Cymyran Strait in Wales, connecting Holy Island with Anglesey, and is approximately three miles (5 km) southeast of Holyhead.

The larger portion of the village is the principal settlement in the community of Rhoscolyn which recorded a population of 542 in the 2011 census.

The village is about one mile (1.5 km) from Valley railway station, and is on the Isle of Anglesey Coastal Path.

The bridge is approximately four miles (6.5 km) from Holyhead via the old road route, giving it, and the village, its name.

A bridge at this location was in existence by 1530,[2] and was the only land route to Holyhead until the construction of the Stanley Embankment in 1823.