DoubleTree by Hilton is an American hotel chain managed by Hilton Worldwide. DoubleTree has been the fastest growing Hilton brand by number of properties since 2007, and by number of rooms from 2007 to 2015. As of December 31, 2019, it has 587 properties with 135,745 rooms in 47 countries and territories, including 122 that are managed with 35,122 rooms.