|Date of birth||c. 1961 (age 55–56)|
|Place of birth||Belfast, Northern Ireland|
|1978–1981||Lock Haven University|
|1982–1990||South Carolina (assistant)|
|1993||U.S. U-18 (assistant)|
Trevor Adair (born c. 1961, in Belfast, Northern Ireland) is the former head coach of the Clemson Tigers men's soccer team. He has coached at the collegiate level since 1982 after playing soccer at Lock Haven University.
Michael Parker, men's soccer head coach at Lock Haven University, recruited Adair who played four seasons, 1978 to 1981, with the Eagles. In 1978, Lock Haven won the Division III NCAA Men's Soccer Championship. In 1980, having moved up a division, they won the Division II title. That year, Adair was selected as a first team All American after leading Lock Haven in scoring with sixteen goals. Adair graduated in 1982 with a bachelor's degree in economics.
Following his graduation from Lock Haven, Adair chose not to pursue a career as a professional player, but to enter the coaching ranks. He moved to the University of South Carolina where he was an assistant coach for nine seasons. Adair moved to Brown University, becoming the men's soccer head coach in November 1990. In his four seasons at Brown, he compiled a 34–24–5 record. In 1993, Adair spent time as an assistant coach with the U.S. U-18 national team. In 1995, Clemson hired Adair as head coach to the men's soccer team. Through 2007, Adair has a 160–71–23 record, having been named the 1998 ACC Coach of the Year in addition to taking the Tigers to the 2005 Final Four. At some point during his career, Adair has also served as an assistant with the United States U-20 men's national soccer team. In April 2009, Clemson placed Adair on a leave of absence after he reportedly assaulted his two daughters during a domestic dispute. Adair resigned as coach on June 14, 2009.
- FC STAR GETTING HIS KICKS BARRETT SELECTED FOR NATIONAL SOCCER TEAM Virginian-Pilot, The (Norfolk, VA) - Thursday, July 22, 1993.
- Police: Tigers' Adair attacked daughters
- Coach Adair resigns: Coach steps down with assault and battery case still pending