The Siøsund Bridge (Danish: Siøsundbroen) is a road bridge that connects the Danish islands of Tåsinge and Siø. It crosses Siøsund, a shallow strait that allowed much of the link to be built as a causeway, the Siø Causeway or Siø Dam (Danish: Siødæmningen).^[2]

The bridge is a low box girder bridge that does not allow the passage of ships. It consists of 20 identical spans, each 27 metres (89 ft) long,^[2] and was the first bridge in Denmark to be built from prefabricated concrete box girders.^[1] The road deck is 7.0 metres (23 ft) wide, with a 2.5 m (8 ft) pavement on either side.^[2]

The bridge and causeway are part of route 9 which also connects Tåsinge to Funen via the Svendborgsund Bridge and Siø to Langeland via the Langeland Bridge.