William Lee Davidson Ewing (August 31, 1795 – March 25, 1846) was a politician from Illinois who served partial terms as the fifth governor of the state and as U.S.

Ewing was born in Paris, Kentucky on August 31, 1795, and practiced law in Shawneetown, Illinois.

[2] James Monroe appointed him to be a land office receiver in Vandalia in 1820.

[2] He served as a Colonel of the "Spy Battalion" during the Black Hawk War.

In 1830, he was elected to serve in the state House of Representatives as Speaker.