William Warren Lowe (12 October 1831 - 18 May 1898) led a volunteer regiment of cavalry from Iowa in the Union Army during the American Civil War.

He graduated from the United States Military Academy in 1853.

He served as a cavalry officer on the frontier in Texas in 1855–1861.

When the Civil War broke out, Lowe fought at First Bull Run.

On several occasions he temporarily led a cavalry brigade and was brevetted brigadier general for war service.