The 2023 NFL season was the 104th season of the National Football League (NFL). The regular season began on September 7, 2023, with defending Super Bowl LVII champion Kansas City losing to Detroit in the NFL Kickoff Game, and ended on January 7, 2024.

The playoffs started on January 13 and concluded with Super Bowl LVIII, the league's championship game, at Allegiant Stadium in Paradise, Nevada, on February 11, 2024. Kansas City defeated San Francisco in overtime, becoming the first team since the 2004 New England Patriots to win back-to-back Super Bowls.

This was the first season since 1935 in which every team in a division (in this case the AFC North) finished with a winning record.

The 2023 NFL league year and trading period began on March 15. On March 13, teams were allowed to exercise options for 2023 on players with option clauses in their contracts, submit qualifying offers to their pending restricted free agents, and submit a Minimum Salary Tender to retain exclusive negotiating rights to their players with expiring 2022 contracts and fewer than three accrued seasons of free agent credit. Teams were required to be under the salary cap using the "top 51" definition (in which the 51 highest paid-players on the team's payroll must have a combined salary cap). On March 15, clubs were allowed to contact and begin contract negotiations with players whose contracts had expired and thus became unrestricted free agents.

This season's salary cap increased to $224.8 million per team, up from $208.2 million in 2022.

Free agency began on March 15. Notable players to change teams included:

The following notable trades were made during the 2023 league year:

Notable retirements