Július Šupler (born 27 October 1950 in Poprad, Czechoslovakia) is a Slovak ice-hockey coach. He was the head coach of HC Donbass in 2012-13.
Šupler began playing ice hockey in his hometown of Poprad and later played in Liptovský Mikuláš. In 1970–1972 he played for Slovan Bratislava and in 1972–1976 for VSŽ Košice.
Šupler has been coach of HC Dukla Trenčín and Riga 2000 and was the first coach of Slovakia national team.
He started coaching as the assistant coach in Poprad 1979–1985, as the head coach in 1985–1987. In 1991–92 season he won Czechoslovakia title with Dukla Trenčín. Since 1993 he was the head coach of Slovakia national team. He led Slovakia to the A-category of IIHF World Championship in the least possible time, by winning the C-category in 1994 and B-category in 1995. He led the Slovakian team also to sixth place at the 1994 Olympic Tournament in Lillehamer. After the 1996 World Championships in Vienna, where Slovakia obtained 10th place, his contract with the Slovak national team was not extended.
In 1996–2006 he was coaching various teams—the Portland Winterhawks in WHL, Slovan Bratislava, and HK Riga 2000 (Latvia).