Two. Although Auburn has been awarded some form of "National Champions" title nine times, it has only one two official titles:
1. 1957 (shared title from the Associated Press)
2. 2011 (BCS Championship)
The Auburn Football Media Guide, produced by the Auburn University Athletic Department, lists the 1913, 1983, 1993, and 2004 seasons as national championship seasons.
Five
I am not sure where they got 5 from but if you include all sporting events Auburn University has won 18.
Football- 1957, 2010
Men's Swimming and Diving- 1997, 1999, 2003, 2004, 2005, 2006, 2007, 2009
Equestrian- 2006, 2011
Outdoor Track and Field- 2006
Women's Swimming and Diving- 2002, 2003, 2004, 2006, 2007
https://oira.auburn.edu/factbook/generalinfo/acw.aspx
The NCAA recognizes five national championship seasons for Auburn in their record book (1913, 1957, 1983, 1993, 2010). Auburn University only claims the 1957 (AP) and 2010 (BCS) seasons as national championships. However, the Auburn Football Media Guide also recognizes the 1913, 1983, 1993, and 2004 seasons as national championships.
Auburn Tigers football was created in 1891.
None.
One
None
The University of Oklahoma has won 7 undisputed NCAA Football Championships.
The NCAA Record Book officially recognizes five national championships for Auburn University (1913, 1957, 1983, 1993, 2010). Auburn University officially only claims the 1957 and 2010 national titles, but also recognizes the 1913, 1983, 1993, and 2004 seasons as "national championships" in their media guide.
Seven.
2
Zero
none
The University of Texas. 16 National Championships (9 men, 7 women). Followed by Auburn at 12.
Auburn University Tigers