- Fort Nassau (Netherlands) at Aardenburg in Zeeland, originally named Fort Nieuw Terhofstede, together with the inevitable Fort Oranje constructed in 1621-1622
- Old Nassau Fort in The Bahamas, under British control, which played a small part in a naval action and amphibious landing during the American Revolutionary War in 1776
- Fort Nassau, Banda Islands, on the island of Bandaneira, constructed in 1609
- Fort Nassau (Curaçao), built in 1797 on the island of Curaçao near Willemstad, later converted to a restaurant
- Fort Nassau (North River) established 1614 in Albany, New York for the Indian trade, later replaced by Fort Orange
- Fort Nassau (South River) established 1627 at Big Timber Creek at Gloucester City, New Jersey
- Fort Nassau (Ghana), established near Mori (probably in the late sixteenth or early seventeenth century), later used for the slave trade
- Fort Nassau (Senegal), Senegal, along with Fort Oranje constructed on an island purchased from the head of a local tribe
- Fort Nassau (Guyana), on the Berbice River
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