William D. Reilich (born March 17, 1957) is an American politician best known for having served as a New York State Assemblyman. He serves as Supervisor of the Town of Greece.
Reilich began his political career by serving on the Greece, New York zoning and environment boards, eventually becoming the GOP chair for the Town of Greece. In the early 1990s, he considered running for the Monroe County, New York legislature, but his campaign failed to materialize when redistricting required by the 1990 census left him without a seat for which to run. In 1997 he was picked by the Republican members of the county legislature, to succeed John T. Auberger who resigned to become Greece town supervisor.
He successfully defended his county legislative seat in 1999 and ran unopposed in 2001.
Reilich was elected to the New York State Assembly in 2002 and served six terms.
In July 2008 he was elected to Chairman of the Monroe County GOP. He stepped down from the role in June 2019.
In November 2013, Reilich was elected to serve as the Supervisor for the Town of Greece. He was re-elected in 2017 and 2021 and retired from office in 2025.
In Town of Greece v. Galloway, the United States Supreme Court ruled in favor of the practice of opening town meetings with a prayerâÂÂa practice Reilich continued from his predecessor.
In 2019, the International Joint Commission (IJC) announced that it had appointed Reilich to the International Lake Ontario-St. Lawrence River Board.