Gregory J. Brannon (born August 17, 1960) is an American physician and political activist. A native of Los Angeles, California, Brannon is a graduate of the University of Southern California and Chicago Medical School. After completing his residency, Brannon established a private obstetrics practice in Cary, North Carolina. An ally of the Tea Party movement, Brannon unsuccessfully sought the Republican nomination for U.S. Senate in the 2014 and the 2016 elections. He came in second place both times, losing the 2014 race to Thom Tillis and the 2016 race to Richard Burr.