- Sep 7 Arvid Wittenberg, Swedish count, field marshal and privy councilor (b. 1606)
- Sep 13 Jacob van Campen, painter/architect (Amsterdam Townhall), dies at 62
- Sep 26 Hadji Chalfa/Katib Tsjelebi, Turkish geographer, dies at 48
- Sep 28 Emilia Secunda Antwerpiana, 6th and youngest daughter of Willem of Orange, dies at 75