William Jerome Flannery, September 30, 1865 – June 25, 1932) was an American songwriter, born in Cornwall-on-Hudson, New York of Irish immigrant parents, Mary Donnellan and Patrick Flannery. He collaborated with numerous well-known composers and performers of the era but is best remembered for his decade-long association with Jean Schwartz with whom he created many popular songs and musical shows in the 1900s and early 1910s.