The 1989 National Soccer League season was the sixty-sixth season under the National Soccer League (NSL) name. The season concluded on September 18, 1989, with Toronto Italia defending their seventh consecutive NSL Championship by finishing first in the First Division. Toronto Italia also claimed the NSL Canadian Championship by defeating Montreal Ramblers of the Quebec National Soccer League (LNSQ) on September 20, 1989, at the Claude Robilliard Stadium in Montreal, Quebec. The NSL Cup was also successfully defended by Toronto Croatia. Croatia would also defeat LNSQ Cup champions St. Leonard to win the Canada Cup.