The NFL’s best defense lines of all time include the 1976 Pittsburgh Steelers, the 1985 Chicago Bears and the 2000 Baltimore Ravens. Out of these three teams, both the 1985 Bears and the 2000 Ravens won those years' Super Bowls.
The 1976 Steelers gave up only 28 points during their last nine games of the season. The 1985 Bears held seven of their opponents to less than 10 points. The 2000 Ravens set the NFL record for fewest points allowed; a total of 165 during the entire season. They also took the record for fewest rushing yards allowed at 970 yards during a 16-week season.