Augustus F. Thrasher is an 1870s Yellowstone photographer about whom we know little. None of Thrasher's Yellowstone photos is known to have survived, although we do have some of his writings on the Park. Thrasher is known to have been in Deer Lodge, Montana, in 1867-69, and by 1870, was located at Bannack as a "daguerrian artist." Sometime during the period 1870-72, he was located at Lewiston, Idaho, and issued stereo views of Idaho.

Thrasher accompanied the Raymond-Clawson party into Yellowstone in 1871, and brought a huge load of photographic supplies with him. C.C. Clawson called him "A.F. Thrasher, photographer, and Prof. of the Fine Arts generally." Raymond wrote a long description of him, saying "he invests the profession of photography with all the romance of adventure" and describing how Thrasher would go anywhere to secure a photo. Thrasher left Deer Lodge in 1872, was active in eastern states after then, and reportedly died in the mid-1870s.