The Samsø Bælt, named after the island of Samsø, is a strait in Denmark that connects the Great Belt with the Kattegat. In the north it is bordered against the Kattegat by a line between the tip of the Ebeltoft peninsula and Gniben on Sjællands Odde, in the southwest it borders the Little Belt between Juelsminde and Æbelø, and in the south between Romsø and the peninsulas of Asnæs and Røsnæs it borders the Great Belt and the Kalundborg Fjord, respectively.
The Samsø Bælt is sometimes considered part of the Kattegat, sometimes also part of the Great Belt.
Sometimes, in a narrower sense, only the water east of Samsø, i.e. between Samsø, Sejerø and Rosnæs, is referred to as Samsø Bælt.
