William Mallory Levy (October 31, 1827 – August 14, 1882) was an American lawyer and Confederate Civil War veteran who served one term as a U.S. Representative from Louisiana from 1875 to 1877.

He served in the Mexican War,[1] as second lieutenant in Company F, First Regiment, Virginia Volunteers.

After leaving Congress, he served as member of the State constitutional convention in 1879.

He was appointed associate justice of the State supreme court in 1879 and served until his death.

His funeral was in the Protestant Episcopal Church in Natchitoches, Louisiana, and he was interred in the American Cemetery there.