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.
• Albany, New York or nearby in 1614 for The Indian Trade. Later replaced by Fort Orange.
• Gloucester, New Jersey in 1626 also for the Indian trade.
• 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 16th or early 17th century.
• In the Netherlands at Aardenburg in Zeeland, originally named Fort Nieuw Terhofstede, together with the inevitable Fort Oranje constructed in 1621-1622.
• On a hill on the Caribbean island of Curaçao near Willemstad, later converted to a restaurant.