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 he is best remembered as the co-founder, along with his twin 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.