- Source: Southern Indiana Athletic Conference
- Fiona O'Sullivan
- Southern Indiana Athletic Conference
- Southern Athletic Conference of Indiana
- Southern Collegiate Athletic Conference
- Southern Intercollegiate Athletic Conference
- Pocket Athletic Conference
- Northern Indiana Athletic Conference
- Mount Vernon High School (Mount Vernon, Indiana)
- Heartland Collegiate Athletic Conference
- SIAC
- Sooner Athletic Conference
The Southern Indiana Athletic Conference (SIAC) is a high school athletic conference based in Evansville, Indiana. Five of the conferences 10 schools; Bosse, Central, Harrison, North, and Reitz; comprise the public Evansville Vanderburgh School Corporation. Mater Dei and Memorial are private Catholic high schools run by the Roman Catholic Diocese of Evansville, and the largest member is Castle, a public school located in neighboring Newburgh in Warrick County under the Warrick County School Corporation. The league was founded in 1936, and at one point stretched far across southern and western Indiana: from Mount Vernon in the west to New Albany in the east, and from Evansville in the south to Terre Haute in the north. Jasper and Vincennes Lincoln announced in May 2019 that they would leave the disbanding Big Eight Conference to rejoin the Southern Indiana Athletic Conference beginning with the 2020–21 season.
Member schools
= Former members
=Linton played concurrently in the SIAC and West Central Conference 1944–45, and the SIAC and WIC 1945–51.
Sullivan played in both the SIAC and West Central Conference 1944–45, and the SIAC and WIC 1945–62.
= Membership timeline
=Conference championships
= Football
== Boys basketball
== Boys cross country
== Wrestling
== Boys soccer
== Boys tennis
== Boys swimming
== Baseball
== Boys golf
== Boys track and field
== Volleyball
== Girls basketball
== Girls cross country
== Girls soccer
== Girls tennis
== Girls swimming
== Softball
== Girls golf
== Girls track and field
=State titles
= John H. Castle Knights
=Football (1982, 1994)
Boys Soccer (2000)
Girls Basketball (2006)
Softball (2001)
= Evansville Benjamin Bosse Bulldogs
=Boys Basketball (1943, 1944, 1962)
= Evansville Central Bears
=None
= Evansville William Henry Harrison Warriors
=Girls Golf (1989)
Boys Golf (2012)
= Evansville Mater Dei Wildcats
=Baseball (1999)
Boys Basketball (2004)
Girls Basketball (2012, 2013)
Football (2001, 2022)
Wrestling (1986, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2006, 2007, 2021)
Softball (2016)
Girls Soccer (2017, 2018, 2019)
= Evansville North Huskies
=Baseball (1962*)
Boys Basketball (1967)
Boys Golf (2000)
Girls Golf (2014, 2015, 2016, 2018, 2020, 2021)
* = indicates title won before IHSAA State Tournament was initiated
= Evansville Francis Joseph Reitz Panthers
=Girls Basketball (1981)
Football (1933*, 1940*, 1948*, 1953*, 1956*, 1957*, 1960*, 1961*, 1971*, 2007, 2009)
Bowling (2012+)
* = indicates title won before IHSAA State Tournament was initiated
+ = indicates title sanctioned by the Indiana High School Bowling Association
= Evansville Reitz Memorial Tigers
=Baseball (1978, 1989, 1993)
Football (1937*, 1958*, 2017, 2019)
Girls Soccer (1989*, 1997, 2008, 2013, 2017, 2021, 2022)
Softball (2002)
Girls Tennis (1991, 1993, 1994, 1995, 1996, 2012)
Boys Soccer (1979*, 1980*, 1981*, 1983*, 1984*, 1986*, 1988*, 1989*, 1990*, 1992*, 2007, 2008, 2016, 2017, 2019, 2020)
Girls Basketball (2011)
* = indicates title won before IHSAA State Tournament was initiated
= Jasper Wildcats
=1949 Boys' Basketball
1996 Baseball
1997 Baseball
1998 Baseball (3A)
1999 Boys' Tennis
2000 Baseball (3A)
2001 Football (4A)
2006 Baseball (3A)
2021 Baseball (4A)
= Vincennes Lincoln Alices
=1923 Boys' Basketball
1981 Boys' Basketball
2002 Baseball (3A)
Neighboring conferences
Big Eight Conference
Pocket Athletic Conference
See also
Sports in Evansville
Hoosier Hysteria
Largest high school gyms in the United States