Koursaroi (Greek: Κουρσάροι, "privateers or privateering vessels"), also known as Nisaki (Greek: Νησάκι, "small island"), is an islet close to the western coast of Crete, and north-east of the islet of Praso, in the Aegean Sea.

Administratively, it is located within the municipality of Kissamos, in Chania regional unit.