|Conference||American Football Conference|
|League||National Football League|
|Founded||1960 (as the American Football League Western Division)|
|No. of teams|
|Most recent champion(s)||Denver Broncos (12th title)|
|Most titles||Tie: Oakland Raiders and San Diego Chargers (15 titles)|
The division has sent teams to the Super Bowl fourteen times beginning with Super Bowl I vs. Green Bay. The Raiders entering 2012 lead in Super Bowl wins with a 3–2 record; the Broncos presently are 2–4 in Super Bowls; the Chiefs are 1–1 while the Chargers went winless in Super Bowl XXIX, their lone Super Bowl appearance.
Entering 2013, the Raiders lead the division with a record of 430–363–11 and an overall playoff record of 25–18. The Broncos record is 418–375–10 with a playoff record of 18–17. The Chiefs record is 404–388–12 with a playoff record of 8–14. The Chargers record is 399–394–11 with a playoff record of 10–16.
The division was formed in 1960 as the American Football League's Western Division. In 1970, as part of the new NFL's two-conference, six-division alignment, the AFL West entered the merged league more or less intact as the AFC West.
The original AFL West had four members – the Dallas Texans (who moved to Kansas City in 1963 as the Chiefs), Denver Broncos, Los Angeles Chargers (who moved to San Diego in 1961) and Oakland Raiders. These four teams have remained in the AFL/AFC West since its inception, and are currently the only teams in the division. Largely because of this, the entire division is considered one very large and very heated rivalry. When the Raiders played in Los Angeles from 1982 to 1994, they remained in the AFC West.
The Cincinnati Bengals played the last two AFL seasons in the AFL West despite being further east than Houston, where the Houston Oilers played at the time and were members of the AFC East. The Bengals (along with the Oilers) moved to the AFC Central (formerly the NFL Century, now the AFC North) in 1970, instantly forming rivalries with the Cleveland Browns and the Pittsburgh Steelers. In 1977, the Seattle Seahawks were added to the AFC West after spending their expansion season in the NFC West; they would move back to the NFC West in 2002. The first-year Tampa Bay Bucs in 1976 played as a member of the AFC West before being aligned into the NFC Central in 1977.
Each of the four AFC West teams won a division title in the first four years of the realignment – Oakland in 2002, Kansas City in 2003, San Diego in 2004 and Denver in 2005. It is the only one of the eight NFL divisions to have all of its teams win titles in the first four seasons of the North-East-West-South format.
In the early and mid 2000s, the division was often cited as one of the NFL's "Toughest Divisions" due partially to the home-field advantages of Sports Authority Field at Mile High, Arrowhead Stadium, Qualcomm Stadium and the Oakland Coliseum, although in 2008 the division was the NFL's weakest since the AFC Central in 1985 by sending the San Diego Chargers to the playoffs as division winners with an 8–8 record while the New England Patriots missed out at 11–5 after losing out on tiebreakers for both the AFC East and the wild-card. The division was also very weak in 2011 as well, when a loss by the Raiders in the last game of the season gave the Broncos the division title with only an 8-8 record. Only the NFC West in 2010 has historically sent a worse division winner to the playoffs, when the Seahawks (themselves a former AFC West member) won that division with a 7-9 record.
Along with the AFC (formerly AFL) East, the AFC West is the oldest NFL division in terms of creation date (1960).
Division lineups 
Place cursor over year for division champ or Super Bowl team.
|AFL Western Division||NFL AFC West Division|
|Dallas Texans||Kansas City Chiefs [A]|
|L A Chargers||San Diego Chargers [B]|
|Oakland Raiders||Los Angeles Raiders [C]||Oakland Raiders|
|Cincinnati Bengals [D]||Tampa Bay Bucs[E]||Seattle Seahawks[F]|
|NFL AFC West Division|
|Kansas City Chiefs|
|San Diego Chargers|
|Team not in division Division Won AFL Championship Division Won AFL Championship, Lost Super Bowl Division Won AFC Championship Division Won Super Bowl|
- A Dallas Texans moved team to Kansas City, Missouri and are subsequently renamed Kansas City Chiefs (1963 season)
- B Los Angeles Chargers moved team to San Diego (1961 season)
- C Oakland Raiders moved team to Los Angeles (1982 season). The team returned to Oakland for the 1995 season.
- D Cincinnati Bengals enfranchised (1968 season). After 1970 merger with NFL, the team was moved to the AFC Central.
- E Tampa Bay was enfranchised in 1976. The Bucs were moved to the NFC Central after one year(1977 season).
- F Seattle Seahawks moved into AFC West from the NFC West division (1977 Season). In 2002 they moved back to the NFC West.
Division champions 
- !The Oakland Raiders and Kansas City Chiefs tied for the regular season division title at 12–2–0. The Raiders won the ensuing playoff game to represent the West in the AFL Championship Game.
- #A players' strike in 1982 reduced the regular season to nine games. Thus, the league used a special 16-team playoff tournament just for this year. Division standings were ignored, the Los Angeles Raiders had the best record of the division teams.
Wild Card qualifiers 
- A players' strike in 1982 reduced the regular season to nine games. Thus, the league used a special 16-team playoff tournament just for this year. Division standings were ignored, the Los Angeles Raiders had the best record of the division teams.
See also 
Total playoff berths 
- Through 2012 season
|San Diego Chargers||15||17||1||1||0||1|
|Kansas City Chiefs||8||16||3||0||1||31|
- 1Chiefs Super Bowl 4 win was before AFL/NFL Merger and did not determine the league championship.