William Lilly (June 3, 1821 – December 1, 1893) served briefly as a Republican member of the U.S. House of Representatives from Pennsylvania in 1893.

Born in Penn Yan, New York, on June 3, 1821, Lilly moved to Carbon County, Pennsylvania, in 1838, and became involved in the mining of anthracite coal.

He was subsequently elected as colonel of one of the militia regiments of the Lehigh Valley and then was promoted to the rank of brigadier general.

Lilly was later elected as a Republican to the Fifty-third Congress and served in that capacity until his death in 1893.

Lilly died in Mauch Chunk, Pennsylvania, on December 1, 1893, and was interred in the City Cemetery.