Ehn represented Sweden at the
2014 IIHF World U18 Championships, where he recorded three assists in seven games. Ehn represented Sweden at the 2015 World Junior Ice Hockey Championships, where he recorded two assists in seven games. Ehn represented Sweden at the 2016 World Junior Ice Hockey Championships, where he recorded one goal and one assist in seven games.<unk> Ehn represented Sweden at the 2016 World Junior Ice Hockey Championships, where he recorded one goal and one assist in seven games.