Buckman Bridge, Road bridge across St. Johns River in Jacksonville, Florida.

Buckman Bridge is a beam-type road bridge carrying I-295 West Beltway traffic over the St. Johns River in Jacksonville, Florida. It runs roughly east–west for about 3.1 miles (5.0 km), with the eastbound and westbound lanes built on separate structures. From a high angle the roadway reads as a level band of pale gray concrete on closely spaced piers above the water.

The bridge opened to traffic in 1970 after completion of a complex construction project that lasted several years. Its opening changed transportation patterns in Jacksonville by creating a direct crossing over the St. Johns River.

The bridge honours Henry Holland Buckman, a legislator and attorney who helped establish Florida's state road system. Its name is a local reference to that work on roads, not to schools or universities. Drivers crossing today use a link that replaced detours of up to 30 miles via downtown Jacksonville or the wooden Shands Bridge.

The bridge carries I-295 West Beltway traffic, with eastbound and westbound lanes on separate structures. Exits sit within 0.5 miles (0.8 km) of either end, so rush-hour backups are typical. Sustained winds over 40 mph (64 km/h) warrant closure during tropical storms. Downtown Jacksonville and Naval Air Station Jacksonville are visible to the north.

During construction, engineers discovered that bacterial activity in the river caused chemical reactions that damaged concrete foundations. This unexpected challenge forced builders to redesign their approach and find new solutions before the bridge could be completed.