The San Diego Chargers season was the franchise's 12th season in the National Football League (NFL) and its 22nd overall. The team failed to improve on their 11–5 record from 1980 and finished 10–6. In the playoffs, they beat the Dolphins in a game known as the Epic in Miami and lost to the Bengals in a game known as the Freezer Bowl.

1981 was the second straight season in which the Chargers reached the AFC Championship Game, as well as their second consecutive loss.

1981 San Diego Chargers season

During this season, the Chargers lost two key players by way of trade. Before Week 3, wide receiver John Jefferson was dealt to the Green Bay Packers, while defensive end Fred Dean would be dealt to the eventual Super Bowl champion San Francisco 49ers by Week 5. The Chargers brought in Wes Chandler from New Orleans to replace Jefferson - after a slow start, he finished with 857 yards from 12 games (he had 1,142 yards on the season, counting his four games with the Saints). The other starting wideout was Charlie Joiner, who had one of his best seasons at age 34, gaining a career-high 1,188 yards and matching his career-best with 7 touchdowns. Rounding out the trio of receiving stars, tight end Kellen Winslow led the league in receptions for the second consecutive year, finishing with 88 catches for 1,075 yards and 10 touchdowns.

1981 San Diego Chargers season

Quarterback Dan Fouts broke the NFL record for passing yardage for the third consecutive season, averaging 300 yards per game for the first time as he totalled 4,802. His touchdown-to-interception ratio was the best of his career, at 33 to 17. He was helped in this by a strong offensive line, anchored by veterans Russ Washington and Doug Wilkerson, which conceded only 19 sacks from 16 games, their best performance through Fouts' 15 years with the club. Running back Chuck Muncie enjoyed his best season, running for 1,144 yards and 19 touchdowns, tying the then-NFL season record for rushing touchdowns. With rookie James Brooks and John Cappelletti also contributing, San Diego rushed for over 2,000 yards for the only time during the pass-focussed Don Coryell's tenure.

1981 San Diego Chargers season

While the offense was soaring to new heights, the defense collapsed in Dean's absence, becoming among the league's worst. They continued to be tough against the run, but with veteran safety Glen Edwards absent with injury through the first half of the season, they dropped to dead last against the pass - the 4,311 yards they conceded were a new NFL record. On the plus side, they did manage an above-average 23 interceptions, with Willie Buchanon snagging a team-leading 5. San Diego's sack count declined somewhat from 60 to 47, tied for third-best in the NFL. New starter John Woodcock tied with Gary Johnson as team-leaders, each managing 9.5 sacks.

On special teams, James Brooks put in a strong performance: his 13.2 yards per punt return was 2nd best in the league; with 23.7 yards per kickoff return, he ranked seventh. Rolf Benirschke made 19 of 26 field goals, including two late game-winners.

The season was chronicled on September 18, 2008 for America's Game: The Missing Rings, as one of the five greatest NFL teams to never win the Super Bowl.

1981 NFL Draft

Personnel

Staff

Roster

Regular season

Schedule

Note: Intra-division opponents are in bold text.

Game summaries

Week 1: at Cleveland Browns

The Chargers opened their season by blowing out Cleveland on Monday night. Despite John Jefferson's holdout, the offense piled up 535 total yards, committing no turnovers, sustaining no sacks, and only punting twice. Rookie James Brooks rushed for the opener 4:10 into the game, and San Diego led the rest of the way, with Chuck Muncie adding another touchdown on the ground before halftime. In the second half, Charlie Joiner had receptions of 51 and 57 yards, and Brooks, Hank Bauer and Ron Smith all caught touchdowns from Dan Fouts. It was Bauer's 20th and final Charger touchdown.

Fouts completed 19 of 25 for 330 yards, 3 touchdowns and no interceptions. Joiner caught 6 passes for 191 yards, the most single-game yards he had as a Charger. Muncie rushed 24 times for 161 yards and a touchdown - with 23 receiving yards, it was the most yards he gained in any game through his career. Cleveland QB Brian Sipe put up 375 yards through the air, but was intercepted by Bob Gregor and Mike Williams as the Browns chased the game.