Robert Mullen
Robert Mullen may refer to:
- Robert Mullen (Nevada politician) (fl. 1868–1872), member of the Nevada Senate
 - Robert S. Mullen (1884–1959), American lawyer and politician from New York
 - Robert R. Mullen, founder of public relations company Robert Mullen Company
 
See also
- Robert N. Mullin (1893–1982), writer of Western history
 - Robert Mullan, British film director, writer and producer