Johanna van Polanen (also spelled as Jehenne; 10 January 1392 – 15 May 1445) was a Dutch noblewoman. She was the daughter of John III of Polanen, Lord of Breda, and his wife, Odilia of Salm. The House of Polanen was a side branch of the still existing House of Wassenaer. Johanna married on 1 August 1403, at the age of 11, in Breda with Engelbert I of Nassau, who became Lord of Breda jure uxoris. Johanna and Engelbert resided in Breda; they also owned houses in Brussels and Mechelen. They had six children: