Ian James Thomas (born 9 May 1979) is a Welsh cricketer who played for Glamorgan as a left-handed opening batsman from 1999 to 2005.
Thomas, along with Graeme Hick, held the record for highest score in the Twenty20 Cup from 2004 to 2006, after scoring 116 not out to lead Glamorgan to a win with three balls to spare against Somerset Sabres in the group stages of the 2004 tournament.
Thomas played for Port Talbot Town in the South Wales Cricket Association between 2007 and 2008.
During his period at the club, Thomas formed a formidable opening partnership with his former Glamorgan county colleague Dan Cherry.
He left at the end of the 2008 season to play for Newport in the South Wales Cricket League.