Zavier Marquis Simpson (born February 11, 1997) is an American professional basketball player for the Memphis Grizzlies of the National Basketball Association (NBA). He played college basketball for the Michigan Wolverines. He briefly played (4 games) for the Oklahoma City Thunder of the National Basketball Association.

Simpson attended Lima Senior High School where he won the 2016 Ohio Mr. Basketball as a senior. Simpson won 2014 Ohio Division III state championship as a sophomore for Lima Central Catholic High School before transferring to Lima Senior High School the following school year. He was part of the 2017–18 team that reached the Championship Game of the 2018 NCAA Division I men's basketball tournament. Simpson was a member of 2017 and 2018 Big Ten Conference men's basketball tournament champions during his first two seasons. He had many of his best games against top-10 opponents as a sophomore. As a junior, he was a 2019 Second team All-Big Ten selection and a Big Ten All-Defensive team honoree and earned the nickname "Captain Hook" for his unusual skill at shooting hook shots. As a senior, he was a 2020 Second team All-Big Ten selection. As a junior he set the current Big Ten men's basketball tournament single-tournament assists record (30) and led the Big Ten Conference in assists as a senior (7.9).