The name Fort Nassau was used by the Dutch in the 17th century for several fortifications, mostly trading stations, named for the House of Orange-Nassau.
Banda Islands on the island Banda Naira, constructed in 1609.
Senegal, along with Fort Oranje constructed on an island purchased from the head of a local tribe.
Ghana, along with Fort Oranje and Fort Amsterdam. Later used for the slave trade. Probably constructed in the late sixteenth or early seventeenth century.
In the Netherlands at Aardenburg in Zeeland, originally named Fort Nieuw Terhofstede, together with the inevitable Fort Oranje constructed in 1621-1622.