Sejerø is a Danish island in the Kattegat sea, north-west of Zealand.

[3] Sejerø with its 328 inhabitants[1] is part of Kalundborg Municipality and covers an area of 12.36 square kilometres (4.77 square miles).

The largest village on Sejerø is Sejerby, housing half of the island's population.

South-east of Sejerø is the smaller island of Nekselø, also in the Bay of Sejerø.

This article about an island of Denmark is a stub.