The top-two teams in the North Atlantic Conference (NAC) West division are set to compete in the 2021 NAC Men's Lacrosse Championship Tournament.

SUNY Poly emerged as the clear #1 seed in the West with an unblemished divisional record, 6-0. SUNY Canton and SUNY Delhi tied for #2 and the final spot in the four-team conference tournament with 3-3 divisional records. SUNY Canton won the advantage using the predetermined tiebreaking procedure used in the NAC.

The game time for the NAC West semifinal is set for 1:00 PM on Saturday, May 1 at SUNY Poly's Wildcat Field.

In this shortened season, teams played divisional schedules for the regular season. Championship hosts were predetermined prior to the start of the season such that men's lacrosse and softball championships will be hosted by the advancing West Division teams, while women's lacrosse and baseball will be hosted by the East Division.

The NAC Championship game is tentatively scheduled for 1:00 PM on Saturday, May 8, 2021. The date and time is subject to change in order to support the academic needs of advancing teams. The conference champion will earn the NAC automatic qualification bid to the 2021 NCAA men's lacrosse national championship tournament.