The Tay Bridge (or Tay Rail Bridge) is a railway bridge about two and a quarter miles (three and a half kilometres) long that spans the Firth of Tay in Scotland, between the city of Dundee and Wormit in Fife. It was opened on 20 June 1887.

This 'new' double-track bridge was designed by William Henry Barlow. It was built by William Arrol & Co. 18 metres (59 ft) upstream of, and parallel to, the original bridge. The foundation stone was laid on 6 July 1883 and construction involved 25,000 metric tons of iron and steel, 70,000 metric tons of concrete, ten million bricks (weighing 37,500 metric tons and three million rivets. Fourteen men lost their lives during its construction, most by drowning.

The original Tay Bridge was designed by noted railway engineer Thomas Bouch, It was a lattice-grid design, combining cast and wrought iron. The bridge was opened for passenger traffic on 1 June 1878. On the night of 28 December 1879 at 7.15 pm, the bridge collapsed after its central spans gave way during high winter gales. A train with six carriages carrying seventy-five passengers and crew, crossing at the time of the collapse, plunged into the icy waters of the Tay. All seventy-five were lost.

The stumps of the original bridge piers, seen here, are still visible above the surface of the Tay even at high tide.