Bo Jonas Hil Karlsson is a former football

Football (soccer)

Association football, more commonly known as football or soccer, is a sport played between two teams of eleven players with a spherical ball...

 referee from Sweden

Sweden

Sweden , officially the Kingdom of Sweden , is a Nordic country on the Scandinavian Peninsula in Northern Europe. Sweden borders with Norway and Finland and is connected to Denmark by a bridge-tunnel across the Öresund....

. He is mostly known for refereeing one match at the 1994 FIFA World Cup

1994 FIFA World Cup

The 1994 FIFA World Cup, the 15th staging of the FIFA World Cup, was held in nine cities across the United States from June 17 to July 17, 1994. The United States was chosen as the host by FIFA on July 4, 1988...

. He also refereed the 1991 UEFA Cup Winners' Cup Final

1991 UEFA Cup Winners' Cup Final

The 1991 European Cup Winners' Cup Final was a football match played between Manchester United and Barcelona on 15 May 1991 at Feijenoord Stadion, Rotterdam. It was the final match of the European Cup Winners' Cup 1990–91 and the 31st European Cup Winners' Cup Final...

 between Manchester United

Manchester United F.C.

Manchester United Football Club is an English professional football club, based in Old Trafford, Greater Manchester, that plays in the Premier League. Founded as Newton Heath LYR Football Club in 1878, the club changed its name to Manchester United in 1902 and moved to Old Trafford in 1910.The 1958...

 and FC Barcelona

FC Barcelona

Futbol Club Barcelona , also known as Barcelona and familiarly as Barça, is a professional football club, based in Barcelona, Catalonia, Spain....

.

In 2010, Karlsson participated in the Swedish Television documentary Rättskiparen (Swedish title – English title: The Referee) about the top European referee Martin Hansson and his road to ref the 2010 FIFA World Cup in South Africa.