The 2017–18 National League season is the 80th season of Swiss professional ice hockey and the first season as the National League (NL). The change from National League A to National League was made at the end of the 2016–17 season. ZSC Lions won their 9th NL title, defeating HC Lugano in game 7 of the finals. SC Bern won the regular season for the second consecutive year. EHC Kloten were relegated to the Swiss League, while SC Rapperswil-Jona Lakers won promotion to the NL for 2018–19.