The 1985 Bears Are Our Pick for the Best Defense in NFL History

New England managed seven rushing yards in Super Bowl XX. Chicago sacked its quarterbacks seven times, forced six turnovers and won 46–10. It was the final demonstration of a defense that had already shut out both of its NFC playoff opponents. The Super Bowl box score remains a persuasive starting point for the argument.

The 1985 Chicago Bears are our pick for the best single-season defense in NFL history. Their combination of regular-season dominance and an extraordinary championship run earns the decision—not an unbeatable claim to every statistical record. The 2000 Ravens have the strongest scoring-and-run-defense counterargument, while the 1976 Steelers, 2002 Buccaneers and 2013 Seahawks offer different versions of greatness.

Here, “best defense” means a team unit in one season, including the postseason—not the greatest individual defender or a franchise’s reputation across decades. The judgment weighs scoring prevention, yards and turnovers, league rankings within each season, and postseason results. A championship strengthens the case; it is not a requirement for consideration.

Why the 1985 Bears lead

Buddy Ryan’s defense finished first in the NFL in points allowed, total yards allowed, rushing yards allowed and takeaways. Chicago surrendered 198 points across 16 regular-season games and forced 54 turnovers, including 34 interceptions. That breadth matters: this was not simply a team with one exceptional pass rusher or one favorable statistical category. (1985 Bears season statistics; Bears’ historical comparison)

Ryan’s “46” scheme crowded defenders near the line of scrimmage and made the offense account for pressure from several directions. With Richard Dent and other pass rushers attacking, and Mike Singletary leading the defense from middle linebacker, Chicago could disrupt both blocking and the quarterback’s decisions. The number referred to former Bears safety Doug Plank’s jersey, not a four-lineman, six-linebacker alignment. (Bears’ schematic history; Ryan’s playbook history)

The deciding evidence came in January: 21–0 over the Giants, 24–0 over the Rams and 46–10 over the Patriots. Three playoff opponents scored ten points combined. Chicago’s only regular-season defeat, 38–24 at Miami, prevents an “invulnerable defense” interpretation, but does not erase the sustained dominance or the finish. (Season results)

How the leading challengers compare

These are five central contenders, shown chronologically rather than presented as a statistically definitive top five.

Defensive unit	Regular-season games	Team points allowed	Points allowed per game	Postseason finish
1976 Steelers	14	138	9.9	Lost AFC Championship Game
1985 Bears	16	198	12.4	Won Super Bowl XX
2000 Ravens	16	165	10.3	Won Super Bowl XXXV
2002 Buccaneers	16	196	12.3	Won Super Bowl XXXVII
2013 Seahawks	16	231	14.4	Won Super Bowl XLVIII

Points allowed are team scoreboard totals, including opponents’ defensive and special-teams scores. Regular-season figures exclude the playoffs; per-game figures are rounded to one decimal place.

2000 Ravens: the strongest alternative

Baltimore allowed 165 regular-season points and just 970 rushing yards, holding runners to 2.7 yards per carry. Ray Lewis operated behind defensive tackles Sam Adams and Tony Siragusa on a unit that kept winning possible even through five consecutive games without a Ravens touchdown. Its postseason opponents scored only 23 points across four games. (Season statistics; ESPN’s anniversary oral history)

The Giants’ only touchdown in Baltimore’s 34–7 Super Bowl victory came on a kickoff return: the defense allowed no points. Choose Baltimore if scoring prevention and stopping the run carry the most weight. Chicago gets our narrow overall edge for leading the league in all four categories highlighted above—Baltimore was second in total yards—and for its two playoff shutouts. Chicago’s playoff opponents averaged 3.3 scoreboard points per game against Baltimore’s 5.8, though Baltimore’s defense itself conceded only 16 points, or 4.0 per game, once the kickoff-return score and extra point are excluded. (Baltimore’s season record; Super Bowl XXXV scoring record)

1976 Steelers: the remarkable sustained stretch

Pittsburgh finished the regular season with nine straight wins, allowing just 28 points during that stretch and recording five shutouts. It also led the NFL in both points and yards allowed. That is a compelling case for the greatest extended stretch of defensive football among these contenders. But the complete season included 110 points allowed in its first five games and ended with a 24–7 AFC Championship Game defeat at Oakland. Chicago’s stronger beginning-to-end defensive performance wins our comparison. (1976 Steelers results and rankings)

2002 Buccaneers: the pass-defense case

Monte Kiffin’s unit led the league in points and yards allowed, intercepted 31 passes and surrendered only ten passing touchdowns in the regular season. It finished by intercepting Rich Gannon five times in Super Bowl XXXVII, returning three for touchdowns. (Season statistics; Super Bowl XXXVII box score)

Tampa Bay has a serious claim beyond raw totals. A comparison published by the Buccaneers favored their 2002 unit after considering league averages and opponent-adjusted efficiency. Our preference for Chicago’s postseason finish is not a claim that every era-adjusted method would select the Bears.

2013 Seahawks: dominance in a different passing era

Seattle led the NFL in points allowed, total yards allowed, passing yards allowed and takeaways. Its championship performance supplies the strongest illustration: a 43–8 victory over a Denver team that had scored 606 regular-season points. The Seahawks’ higher raw scoring allowance should not automatically disqualify them when the offensive environment was different. (Seattle’s season rankings; Denver’s season record)

Why the lowest total does not settle it

NFL history extends well before the Super Bowl. Steve Owen’s 1944 Giants allowed only 75 points in ten regular-season games—7.5 per game—and recorded five shutouts. Those numbers deserve recognition, but a ten-game season in the wartime NFL is not directly interchangeable with a later 16-game schedule. (1944 Giants season record)

Per-game figures correct schedule length, not differences in rules, passing frequency, opponents or field position. Nor can a hypothetical matchup establish what an older defense would do unchanged against a modern offense. Chicago’s own retrospective discusses the adjustments its 46 scheme would need against spread formations and stricter rules governing defensive hits and contact. (Bears’ era comparison)

The choice is therefore a historical judgment, not a record-book entry: Chicago in 1985 combines league-leading defensive breadth with the strongest championship finish in this comparison.