1977 NFL season

Tommy Bell retired after the 1976 season. His line judge, Jerry Markbreit (an NFL rookie in 1976), was named his successor. Bell worked two Super Bowls, III and VII. Markbreit would work four Super Bowls, and is (as of 2025) the only referee to achieve this.

• The head slap is outlawed.^[3] This change is referred to as the "Deacon Jones Rule"; the Los Angeles Rams' defensive end frequently used this technique.
• Any shoe worn by a player with an artificial limb must have a kicking surface that conforms to that of a normal kicking shoe.^[3] Informally referred to as the "Tom Dempsey Rule". Dempsey was a record-breaking placekicker whose modified shoe (having a flattened and enlarged toe area) on his deformed kicking foot generated controversy during his career.
• Defenders are only permitted to make contact with receivers once.
• Defenders are not allowed to make contact with an opponent above the shoulders with the palms of their hands, except to ward him off the line.
• Offensive linemen are not allowed to thrust their hands to a defender's neck, face, or head.
• Wide receivers are not allowed to clip defenders.
• This was the first season in which time of possession was recorded.

Tampa Bay and Seattle continued as "swing" teams that did not participate in regular conference play. Every other NFL team played a home-and-away series against the other members in its division, two or three interconference games, and the remainder of their 14-game schedule against other conference teams. Tampa Bay switched to the NFC and played the other 13 members of the conference, while Seattle did the same in the AFC. The teams met in Week Five, with Seattle winning 30–23.

Starting in 1970, and through 2001, except for the strike-shortened 1982 season, there were three divisions (Eastern, Central and Western) in each conference. This was the final season in which the winners of each division, and a fourth "wild card" team based on the best non-division winner, qualified for the playoffs. The tiebreaker rules were changed to start with head-to-head competition, followed by division records, common opponents records, and conference play.

National Football Conference

American Football Conference

Highlights of the 1977 season included:

• Thanksgiving: Two games were played on Thursday, November 24:

1. The first featured Chicago at Detroit. Chicago would prevail by a 31–14 final margin
2. In the second the Miami Dolphins visited St. Louis to play the Cardinals, defeating them by a 55–14 mark. Dolphins quarterback Bob Griese would throw for six touchdown passes,^[4] while the Dolphins would set a franchise record for most points scored in one game with 55^[ii] Of note, the Dolphins would score eight touchdowns and accumulate 34 first downs.

* The Denver Broncos (the AFC 1 seed) did not play the Oakland Raiders (the 4 seed) in the Divisional playoff round because both teams were in the same division.
** Indicates double overtime victory

• The Buffalo Bills changed from gray to blue facemasks.
• The Pittsburgh Steelers changed from gray to black facemasks.
• The Tampa Bay Buccaneers changed the color scheme of the numbers on their white jerseys. In 1976, the numbers were orange with red trim; in 1977, they became red with orange trim to increase visibility.

This was the fourth and final year under the league's broadcast contracts with ABC, CBS, and NBC to televise Monday Night Football, the NFC package, and the AFC package, respectively. All three networks renewed their deals for another four years. Don Meredith returned to ABC after spending three seasons at NBC, while Alex Karras returned to his acting career. John Brodie was promoted to replace Meredith as NBC's lead color commentator, while Merlin Olsen replaced Brodie on the network's #2 team. NBC also renamed its pregame show, referring to it as NFL '77 to start and updating the program's title every new season.^[6]