The 2019 National Lacrosse League season, formally known as the 2018–2019 season, is the 33rd in the history of the NLL. It was originally scheduled to begin on December 1, 2018 and ending with the NLL final in late spring of 2019. This season is the inaugural season for the expansion teams San Diego Seals and Philadelphia Wings. This is also the final season for the Rochester Knighthawks under owner Curt Styres, as the team's operations are being relocated to Halifax for the 2019–20 season while Pegula Sports and Entertainment takes over the Knighthawks moniker with a new expansion team.