Diego Kostner (born August 5, 1992) is an Italian professional ice hockey Winger who is currently playing for HC Ambrì-Piotta of the Swiss National League (NL).

He previously played as a youth and his first five professional years with fellow Swiss club, HC Lugano of the NLA.

[1] On February 15, 2016, Kostner agreed to a two-year deal with HC Ambrì-Piotta beginning in the 2016–17 season.

[2] Kostner was named to the Italy national ice hockey team for competition at the 2014 IIHF World Championship.

[3] This Italian biographical article relating to ice hockey is a stub.