The 1986 National Soccer League season was the sixty-third season under the National Soccer League (NSL) name. The season began in late May 1986 and concluded in early October 1986 with the NSL Championship final where Toronto Italia defeated Toronto Blizzard. Though the Blizzard would still manage to secure a treble after finishing first in the standings to claim the regular-season title, and defeating London Marconi for the NSL Ontario Cup. Toronto would earn the treble by defeating Vancouver Columbus Italia for the NSL Canadian Championship. The fourth piece of silverware was claimed by the Blizzard after defeating Luso Stars of the Quebec National Soccer League (LNSQ) for the NSL Canada Cup.