Nathan "Nate" Brannen (born 8 September 1982) is a Canadian retired middle-distance runner from Cambridge, Ontario, who competed at three Summer Olympics: 2008, 2012 and 2016.

[3][4] Brannen is currently the Cross Country head coach at St. Edward High School in Lakewood, Ohio.

[5] As an 18-year-old student at Preston High School in his hometown of Cambridge, Ontario, Brannen became only the seventh sub-four-minute high school mile recorder in the history of North America, at the 2001 Aileen Meagher Track Classic in Halifax, Nova Scotia.

[6][7] Originally, Brannen intended to join University of Arkansas and their prestigious track program[8] but ended up being recruited by University of Michigan, in the same recruiting class as Alan Webb.

In July 2016, he was named to Canada's Olympic team.