1999 Kansas City Chiefs season

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.

In the final game of the season against the Oakland Raiders, the Chiefs were denied a trip to the playoffs and a AFC West division title when Raiders kicker Joe Nedney kicked a field-goal in overtime. Coincidentally, Nedney, with the San Francisco 49ers, kicked a field goal in overtime against the Denver Broncos in 2006 and the Chiefs gained the wild-card ticket to the playoffs.