The 2017–18 NHL season is the 101st season of operation (100th season of play) of the National Hockey League. With the addition of a new expansion team, the Vegas Golden Knights, 31 teams compete in an 82-game regular season. The regular season will begin on October 4, 2017, and will end on April 7, 2018. The 2018 Stanley Cup playoffs will then begin a few days afterwards, with the Stanley Cup Finals held in early June.

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On June 22, 2016, the NHL confirmed that it had granted an expansion franchise in the city of Las Vegas to an ownership group led by Bill Foley, whose identity was revealed as the Vegas Golden Knights on November 22. The team will play in the Pacific Division of the Western Conference.

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On April 3, 2017, the NHL announced that, after five Olympic tournaments in which the NHL allowed its players to participate in the event, it would not do so for the men's hockey tournament at the 2018 Winter Olympics in Pyeongchang, South Korea. Furthermore, the league did not include a break for the Olympics in its schedule, and scheduled its All-Star Game as usual for late-January shortly prior to the Olympics (historically, the All-Star Game was not played during Olympic years).Each team's mandatory bye week, stipulated in the league's CBA, was also scattered throughout the month of January.

The restriction will apply to any player under NHL contract, including those in its affiliated minor leagues. Several players have vowed to participate anyway, most notably Alexander Ovechkin and Evgeni Malkin. As the league had little legal room to enforce a ban itself without running afoul of the National Hockey League Players Association, the league instead colluded with the International Ice Hockey Federation, who agreed to establish a blacklist forbidding

This is the seventh season under the NHL's ten-year U.S. rights deal with NBC Sports, and the fourth season of its twelve-year Canadian rights deals with Sportsnet and TVA Sports.

AT&T SportsNet Rocky Mountain (which, along with AT&T SportsNet Pittsburgh, the regional broadcaster of the Pittsburgh Penguins, re-branded from Root Sports over the off-season) will hold the regional television rights for the new Vegas Golden Knights expansion team. TSN has re-gained regional English-language rights to the Montreal Canadiens, and extended its radio contract with co-owned CKGM. Rogers Media has acquired the radio rights for the Vancouver Canucks for newly acquired 650 CISL.

The NHL's centennial commemorations will continue into the 2017–18 season, as its 100th season of play. On March 17, 2017, the NHL announced that it would hold an outdoor game at TD Place Stadium between the Ottawa Senators and Montreal Canadiens on December 16, 2017, to formally mark the 100th anniversary of their first NHL game. The Toronto Maple Leafs will mark the centennial of the NHL's first game (which involved their predecessor, the Toronto Arenas) during their December 19, 2017 game against the Carolina Hurricanes.