The 1999 Kansas City Chiefs season began with the promotion of Defensive coordinator Gunther Cunningham to Head coach following the resignation of Marty Schottenheimer after the Chiefs' 1998 season. The team finished with a 9–7 record and 2nd place in the AFC West. The 1999 season marked the team's 40th season and also the anniversary of the founding of owner Lamar Hunt's American Football League.