William Rosenberg (June 10, 1916 - September 22, 2002) was an American Jewish entrepreneur best known for founding the Dunkin' Donuts franchise in 1950 in Quincy, Massachusetts, one of the pioneers in name-brand franchising, originally named the "Open Kettle" doughnut shop when established in 1948. At the end of 2011, there were more than 10,000 outlets of the chain in 32 countries.