Forten
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Oma, fort (Haruku)
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Onrust, fort Eiland
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Ontmoeting, fort
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Oosteinde, fort
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Oostenburgh, fort
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Orange, fort (Goree)
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Oranje, fort (Albany)
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Oranje, fort (Amazone)
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Oranje, fort (Itamaracà)
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Oranje, fort (Oranjestad)
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Oranje, fort (Sekondi)
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Oranje, fort (Ternate)
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Overburg, fort
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Oyster Bay, fort
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Padjajaram, fort
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Panga, fort