The Éolienne Bollée is an unusual wind turbine, unique for having a stator and a rotor, as a water turbine has. The eponymous invention was first patented in 1868 by Ernest Sylvain Bollée in France. A further patent dated 1885 differed mainly in two ways: First, in how the turbine was turned to face the wind and second, in an improvement which increased the flow of wind through the turbine was added. The turbines built according to the 1885 patent were commercially successful.

Unconventional wind turbines are those that differ significantly from the most common types in use.