Florentine Sophie (Florrie) Rost van Tonningen-Heubel (Amsterdam, November 14, 1914 – Waasmunster, March 24, 2007) was a Dutch National Socialist. She was the wife of NSB leader Meinoud Rost van Tonningen and, after the Second World War and the death of her husband in 1945, continued to support and promote National Socialism throughout her life. For this reason, she was known as the Black Widow.