Robert 'Bob' E. Rankin (born December 31, 1969) is an American politician currently serving as a Republican member of the Colorado State Senate for the 8th district since 2019. He was appointed to the State Senate by a vacancy committee in January 2019 after the resignation of Randy Baumgardner. Previously, Rankin served in the Colorado House of Representatives representing District 57 from January 9, 2013, to January 21, 2019.