The Redoubt Duijnhoop was a square demi-bastioned clay and timber Redoubt built fort constructed at the mouth of the Salt River, leading into Table Bay, South Africa in January–February 1654. It formed part of the defences of the Vereenigde Oost-Indische Compagnie 'VOC' replenishment station, which had been established under Jan van Riebeeck in 1652. The purpose of the station was to supply ships travelling between the Netherlands and the Dutch East Indies.