Robert McGill Loughridge (December 24, 1809 – July 8, 1900) was an American Presbyterian missionary who served among the Creek in Indian Territory. He attended Miami University, Ohio, and graduated in 1837. Loughridge was ordained as a Presbyterian minister in October 1842. He entered Indian Territory in 1843, when he established the Koweta Mission in the Creek Nation. Seven years later, in 1850, he established the Tullahassee Mission, also in Creek territory.