Olin Levi Warner (April 9, 1844 – August 14, 1896) was an American sculptor and artist noted for the striking bas relief portrait medallions and busts he created in the late 19th century.

In 1869, he had saved up enough money to move to Paris, where he studied sculpture at the École nationale supérieure des Beaux-Arts under François Jouffroy, and worked as an assistant to Jean-Baptiste Carpeaux.

A trip through the Northwest Territory led to a series of Native American-themed portrait medallions.

[3] After meeting with little commercial success, however, he returned to live at his father's farm in Vermont, where he also did work for manufacturers of silver and plated ware.

In the 1970s, Warner's heirs donated his collection of personal papers to the Smithsonian Institution's Archives of American Art.