The 2004 NFL season was the 85th regular season of the National Football League.

With the New England Patriots as the defending league champions, regular season play was held from September 9, 2004 to January 2, 2005. Hurricanes forced the rescheduling of two Miami Dolphins home games: the game against the Tennessee Titans was moved up one day to Saturday, September 11 to avoid oncoming Hurricane Ivan, while the game versus the Pittsburgh Steelers on Sunday, September 26 was moved back 7½ hours to miss the eye of Hurricane Jeanne.

The playoffs began on January 8, and eventually New England repeated as NFL champions when they defeated the Philadelphia Eagles in Super Bowl XXXIX, the Super Bowl championship game, at ALLTEL Stadium in Jacksonville, Florida on February 6.

W = Wins, L = Losses, PCT = Winning Percentage, PF= Points For, PA = Points Against

Clinched playoff seeds are marked in parentheses and shaded in green. No ties occurred this year.

The following teams and players set all-time NFL records during the season:

The National Football League has enjoyed success in selling out many of their venues from season ticket sales alone. Out of 32 teams in the league, 24 claim to have waiting lists from under 1,000 people to over 150,000. For some fans, this means a wait not just of years, but decades. This is due mostly to the NFL's short window of play; there are only eight regular-season home games, forcing the most devoted fans into a desperate and sometimes costly search for a limited number of events.

Since 1973, the waiting lists have also had the by-product of preventing any home games of certain teams from being blacked out on local television. Home games must be sold out within 72 hours of kickoff before a telecast is allowed, and the longest waiting lists have ensured every home game of the applicable teams being locally televised. Prior to 1973, home games could not be locally televised even if they were sold out. Four teams have had the benefit of not seeing any blackouts at all since 1972.

Personal Seat Licenses (PSLs) is a license which grants the holder the right to buy season tickets for a particular team. PSLs were first used in the NFL by the expansion Carolina Panthers in 1993 to help finance their new stadium. Since that time, several teams have used the mechanism to finance new stadium projects including the Chicago Bears remodel of Soldier Field and more recently the Dallas Cowboys. The New York Jets and the New York Giants used PSL programs to finance the construction of the New Meadowlands Stadium, now MetLife Stadium.