The 1999Jacksonville Jaguars season was the team's fifth year in the National Football League. Wide receiver Jimmy Smith set a franchise record for most receptions and receiving yards in one season. Smith would finish second in the NFL in receiving yards with 1,636 yards. The Jaguars' regular season record of 14–2 still stands as their best record in franchise history. Both losses during the regular season were to the Tennessee Titans and they lost also to Tennessee in the AFC Championship Game making the Titans the only team to beat them the entire season.
The Jaguars received a break in the schedule by not having to face the eventual Super Bowl champion St. Louis Rams during the regular season. Jacksonville defeated the other four teams in the NFC West at the time, including a 41–3 destruction of the San Francisco 49ers on opening day.
The Jaguars hired former Carolina Panthers head coach Dom Capers to be their defensive coordinator. Under Capers, the team went from 25th in 1998 to 4th in 1999 in total defense. The Jaguars defense yielded the fewest points in the NFL with 217 (an average of 13.6 points per game).