Kopu Bridge, Swing bridge in Thames-Coromandel District, New Zealand

Kopu Bridge is a single-lane swing bridge over the Waihou River near its mouth in the Thames-Coromandel District. Completed in 1928, it has 23 spans and a total length of 463 metres, with a 43-metre swinging span in the middle. It is New Zealand's only remaining operational swing bridge.

Construction of the Kopu Bridge was first negotiated in 1911 and planned from 1922; the Main Highways Board completed it in 1928 as the first crossing of the Waihou River. It replaced the barges and ferries that had served the crossing, linking Thames with the drained dairy farmland of the Hauraki Plains. The project was seen as typical of Prime Minister Gordon Coates's drive to develop the rural economy.

The bridge's swing span could be opened to give vessels a 15.3 m wide channel, a reminder that the Waihou River was once navigable up to Paeroa and river shipping mattered here. Since 2011 the Historic Kopu Bridge Society has worked to keep the structure in community ownership as a pedestrian and cycleway.

The old bridge was closed to vehicles when the new two-lane bridge opened just to its south in December 2011, so it is now reached on foot or by bike. The swing span could open a 15.3 m wide channel for boats. A local society has worked since 2011 to keep it as a pedestrian and cycleway.

The swing span opens a channel 15.3 metres wide for passing vessels, though boat traffic had become rare before the bridge closed to cars. It is New Zealand's only remaining operational swing bridge.