William Frederick Steuart (1816–1889) was a Maryland-born medical doctor who served in the Confederate States Army during the American Civil War.

He was a surgeon in the 3rd North Carolina Infantry Regiment, a unit that formed part of the brigade commanded by his cousin, General George H. Steuart.

[5] Steuart and his wife fled their home state and joined the Confederate cause with around $20,000 in paper and precious metal which they smuggled out of Maryland, rolling up bills of exchange and hiding them in their belongings.

[7] His assistant surgeon was Thomas Fanning Wood, whose detailed account of the regiment's wartime experience would be published in 2000 by the University of Tennessee Press.

Despite being "esteemed by officers and men" in the regiment, it appears that army life was too much for him, as the "rigors of march" and the "hardships of camp" [6] eventually obliged him to apply to be posted away from front line duty.