Broadnax is a surname. Notable people with the surname include:
Horace Broadnax, the head men's basketball coach at Savannah State University
Morris Broadnax (1931–2009), Motown songwriter
Robert Broadnax Glenn (1854–1920), the Democratic governor of the U.S. state of North Carolina from 1905 to 1909
Walter Broadnax, Distinguished Professor of Public Administration at the Maxwell School of Syracuse University
Willmer "Little Ax" Broadnax, (1916–1994), African-American hard gospel quartet singer
