Hardegg Thayabrücke, International road bridge between Hardegg, Austria and Čížov, Czech Republic.

The Hardegg Thayabrücke is a four-span steel truss footbridge and cycle crossing over the Thaya between Hardegg and Čížov, built by the Vienna firm Ignaz Gridl. Its four spans measure 18.25 metres each, the trusses stand 2.15 metres high and the deck is 4.20 metres wide.

Built in 1873/1874 alongside the new road to Hardegg, the steel structure was commissioned from the Viennese firm Ignaz Gridl. The crossing was closed from 1945 at the Iron Curtain, and efforts to reopen it during the Prague Spring failed. It reopened on 12 April 1990, only for pedestrians and cyclists.

The bridge is named after the Thaya river it crosses and links Hardegg with Čížov, a district of Horní Břečkov. Since 2001 it has been part of the "Retzer Land – Feuriges Land" event series, when its steel girders were wrapped in red plastic film and lit up in red.

The bridge is open only in the warm season and, at the request of the Podyjí national park administration, only to pedestrians and cyclists, since the Hardegg–Čížov road lies inside the park. The steel structure is approved for a maximum load of six tonnes.

The steel truss was wrapped in red plastic film during the 2001 "Retzer Land – Feuriges Land" event series, when many sites in the region were lit red. The bridge has four spans of 18.25 m each, with trusses 2.15 m high and a 4.20 m wide deck.