Hellmut Heinz Krug (born 19 May 1956, in Gelsenkirchen) is a retired German football referee. Krug officiated at both the 1994 FIFA World Cup and UEFA Euro 1996. In 1998, he refereed the UEFA Champions League final between Real Madrid and Juventus, and he also officiated a 2000 UEFA Cup semi-final first leg between Galatasaray and Leeds United. Krug additionally refereed at two UEFA European Championship tournaments, in 1992 and 1996.