Bo Daniel Theorin (born 4 August 1983) is a retired Swedish footballer, who played as a defender. He had a 3+1⁄2-year-long successful stint in Gefle IF, but left the club in November 2011, signing a three-year contract with Hammarby. He left Hammarby in November 2014, after a three-year stint at the Stockholm based club. Theorin previously played for FC Lyn Oslo in the Norwegian Premier League and Malmö FF whom he left in June 2008.