William Preucil (born January 30, 1958) is an American violinist. During a musical career spanning several decades, he served as concertmaster for four major American orchestras, most notably the Cleveland Orchestra from 1995, until he was dismissed in 2018. He also played with the Cleveland Quartet, which won a Grammy Award for Best Chamber Music Performance in 1997. He was a longtime member of the faculty at Cleveland Institute of Music until his resignation in 2018, following allegations of sexual misconduct.