The 2018 Toronto Argonauts season was the 61st season for the team in the Canadian Football League and their 146th season overall. The Argonauts failed to improve upon their 9–9 record from 2017, losing their tenth game of the season to the Calgary Stampeders on September 28. Following their week 17 loss to the BC Lions on October 6, 2018, the Argonauts were the first team eliminated from post-season contention. They became the first team since the 2006 Edmonton Eskimos to fail to qualify for the playoffs in the year after winning the Grey Cup.