The 2005 season was the Kansas City Chiefs' 36th in the National Football League (NFL), their 46th overall, and their fifth and final season under head coach Dick Vermeil.
The 2004 season was the Kansas City Chiefs' 35th in the National Football League (NFL), their 45th overall and their 42nd in Kansas City.
The 2002 season was the Kansas City Chiefs' 33rd in the National Football League (NFL), their 43rd overall and the franchise's 40th in Kansas City, Missouri.
The 2001 season was the Kansas City Chiefs' 32nd in the National Football League (NFL) and their 42nd overall. It was their first year under head coach Dick Vermeil and 13th under general manager Carl Peterson. They finished the regular season with a 6–10 record.
The 2000 season was the Kansas City Chiefs' 31st in the National Football League (NFL), their 41st overall and their second and final season under head coach Gunther Cunningham. They failed to improve on their 9–7 record from 1999 and finished the season 7–9, marked by a series of on and off-field struggles and incidents.
The 1999 season was the Kansas City Chiefs' 30th in the National Football League (NFL) and their 40th overall. The season began with the promotion of defensive coordinator Gunther Cunningham to head coach following the resignation of Marty Schottenheimer after the Chiefs finished with a 7–9 record in 1998.
The 1997 season was the Kansas City Chiefs' 28th in the National Football League (NFL) and their 38th overall. The Chiefs improved on their 9–7 record from 1996, and finished with a 13–3 record and as AFC West division champions. The Rich Gannon–Elvis Grbac quarterback controversy was a focal point of the team's season. It brewed throughout the entire season and arguably cost the Chiefs a victory in the playoffs. The Chiefs were defeated by division rival and eventual Super Bowl champion, Denver Broncos, in the 1997 playoffs. 1997 was the final season the Chiefs appeared in the playoffs during the 1990s and for the next several seasons, they fell into futility. They did not return to the playoffs until 2003.
The 1996 season was the Kansas City Chiefs' 27th in the National Football League (NFL) and their 37th overall. Following their loss to the Colts in the playoffs the year before, the Chiefs failed to improve their 13–3 record from 1995 and finishing 9–7 record and second-place finish in the AFC West. Despite being predicted as one of the eventual winners of Super Bowl XXXI by Sports Illustrated, the team missed the playoffs for the first time since 1989.
The 1994 Kansas City Chiefs season was the franchise's 25th season in the National Football League, the 32nd as the Kansas City Chiefs and the 35th overall. They failed to improve their 11–5 record from 1993 and finishing with a 9–7 record and Wild Card spot in the 1994–95 playoffs. The Chiefs lost to the Miami Dolphins 27–17 in the wild-card round. Alongside celebrating the NFL's 75th anniversary season, Hall of Fame quarterback Joe Montana retired following the season.
The 1992 Kansas City Chiefs season was the franchise's 23rd season in the National Football League and the 33rd overall. The Chiefs matched their 10–6 record from 1991, but were shut out by the San Diego Chargers 17–0 in the wild-card round.
The 1991 Kansas City Chiefs season was the franchise's 22nd season in the National Football League and 32nd overall. They failed to improve on their 11–5 record from 1990 and finished with a 10–6 record. Compared to the Chiefs' 1990 campaign, Steve DeBerg’s consistency had dropped. The running game made up for lost time as Christian Okoye ran for 1,031 yards for the season, Barry Word was productive, and rookie Harvey Williams was outstanding in limited playing time. The Chiefs defeated their division rival, the Los Angeles Raiders in the Wild Card round, resulting in the franchise's first playoff victory since Super Bowl IV in 1970. The next week, the Chiefs lost to the Buffalo Bills in the divisional playoffs.
The 2007 Kansas City Brigade season was the second season for the arena football franchise. They made the playoffs for the first time in franchise history, going 10–6 as compared to the 3–13 record in 2006. However, they lost in the first round of the playoffs to the Colorado Crush 49–42.
The 1986 Kansas City Chiefs season was the franchise's 17th season in the National Football League and the 27th overall. It ended with a 10–6 record, the most wins for the franchise since 1971. The Chiefs clinched a wild card playoff berth, but lost to the New York Jets 35–15.
The 1988 Kansas City Chiefs season was the franchise's 19th season in the National Football League and the 29th overall.
The 2011 Milwaukee Mustangs season is the third season for the franchise, and the second in the Arena Football League (AFL). This is the first season for the team as the Mustangs, having previously been known as the Milwaukee Iron. The team is coached by Bob Landsee and plays their home games at Bradley Center. The Mustangs finished 7–11, missing the playoffs.
The 2011 Dallas Vigilantes season was the second season for the franchise in the Arena Football League. The team was coached by Clint Dolezel and played their home games at the American Airlines Center. The Vigilantes finished the regular season 11–7, qualifying for the playoffs for the first time in franchise history. As the 3rd seed in the National Conference, they lost to the Chicago Rush in the conference semifinals, 51–54.
The 2011 Kansas City Command season was the fourth season for the franchise in the Arena Football League, and the first under their new team name, having previously been known as the Kansas City Brigade. The team was coached by Danton Barto and played their home games at Sprint Center. This is the first season for the Command since 2008, after the league went on hiatus in 2009 and the franchise was not active in 2010. The Command finished the season 6–12, failing to qualify for the playoffs.
The 2014 season was the Kansas City Chiefs' 45th in the National Football League (NFL), their 55th overall and their second under the head coach/general manager tandem of Andy Reid and John Dorsey. The Chiefs broke the crowd noise record on Monday Night Football against the New England Patriots on September 29, 2014 with a crowd roar of 142.2 decibels. The Chiefs failed to match their 11–5 record from 2013, and missed the playoffs. However, they defeated both teams that would eventually meet in that season's Super Bowl: the New England Patriots and the Seattle Seahawks. The 2014 Kansas City Chiefs became the first NFL team since the 1964 New York Giants, and the only team in the 16 game season era, to complete an entire season with no touchdown passes to a wide receiver.
The 2016 season was the Kansas City Chiefs' 47th in the National Football League (NFL), their 57th overall and their fourth under head coach Andy Reid and the fourth and final season under general manager John Dorsey who was fired June 22, 2017. The Chiefs clinched their first AFC West division title since 2010, beginning a streak of eight consecutive that still stands as of 2023. The Chiefs also clinched a first-round bye for the first time since 2003, but lost to the Pittsburgh Steelers in the Divisional round 18–16.
The 2017 Kansas City Chiefs season was the franchise's 48th season in the National Football League, the 55th as the Kansas City Chiefs, the 58th overall, the fifth under head coach Andy Reid, and first under general manager Brett Veach. They won the AFC West, but lost to Tennessee in the wild-card round after blowing a 21–3 lead at the half. The season was the first to feature future two-time MVP and three-time Super Bowl MVP Patrick Mahomes whose first start came in the last game of the regular season against the Denver Broncos, a game which had no playoff implications as the Chiefs had secured the division in Week 16.
