1966 Detroit Lions season

The  Detroit Lions season was their 37th in the league. The team failed to improve on their previous season's output of 6–7–1, winning only four games. They missed the playoffs for the ninth straight season and incurred their second losing record in a row.

Schedule

 * A bye week was necessary in 1966, as the league expanded to an odd-number (15) of teams (Atlanta); one team was idle each week.