Frederick Ogilvie Loft (February 3, 1861 – 1934, Mohawk name Onondeyoh, also known as F. O. Loft or Fred O. Loft) was a Mohawk nation activist who founded the League of Indians of Canada. He has been counted among "the great Indian activists of the first half of the twentieth century." He was also a World War I veteran and was active in encouraging recruitment. He stood nearly 6 feet (1.8 m) tall and weighed 170 pounds (77 kg).