Öregrund is a locality situated in Östhammar Municipality, Uppsala County, Sweden.

The town was granted a royal charter in 1491, by request from citizens from nearby city of Östhammar.

The royal council granted the request to construct a city at the end of the archipelago where the sea opened.

A young Gustav Eriksson tried to gather an army, and Öregrund became the port whereto ships with men and weapons were transported.

However, the summer residents led to decreased tax incomes for economically troubled city.

In 2017 Öregrund was used as scenery for the Dutch television show Kroongetuige (Crown Witness).