Freelan Oscar Stanley (June 1, 1849 – October 2, 1940) was an American inventor, entrepreneur, hotelier, and architect. He made his fortune in the manufacture of photographic plates but is best remembered as the co-founder, with his brother Francis Edgar Stanley, of the Stanley Motor Carriage Company which built steam-powered automobiles until 1920. He also built and operated the Stanley Hotel in Estes Park, Colorado.