Hellmut Heinz Krug (born 19 May 1956, in Gelsenkirchen) is a retired German football referee.
Krug officialed both the 1994 World Cup and the Euro 96.
In 1998, he refereed the Champions League final between Real Madrid-Juventus and 2000 UEFA Cup Galatasaray-Leeds United semi final first leg match.
He also refereed two UEFA European Football Championship tournaments in 1992 and in 1996.
He currently works as a pundit for German TV broadcaster Das Erste.