- Source: 1918 Southern Intercollegiate Athletic Association football season
- 1918 Southern Intercollegiate Athletic Association football season
- 1919 Southern Intercollegiate Athletic Association football season
- 1917 Southern Intercollegiate Athletic Association football season
- South Atlantic Intercollegiate Athletic Association
- 1918 The Citadel Bulldogs football team
- 1918 Vanderbilt Commodores football team
- SMU Mustangs football
- Mercer Bears football
- 1918 Mississippi A&M Aggies football team
- 1918 Ole Miss Rebels football team
The 1918 Southern Intercollegiate Athletic Association football season was the college football games played by the member schools of the Southern Intercollegiate Athletic Association as part of the 1918 college football season. The season began on September 28.
Georgia Tech was conference champion. Center Bum Day was the first Southern player ever selected to Walter Camp's All-America first-team.
Regular season
SIAA teams in bold.
= Week One
== Week Two
== Week Three
== Week Four
== Week Five
== Week Six
== Week Seven
== Week Eight
== Week Nine
== Week Ten
== Week Eleven
=Awards and honors
= All-Americans
=E – Bill Fincher, Georgia Tech (MS; TM-1, WC-2)
T – Joe Guyon, Georgia Tech (MS)
C – Bum Day, Georgia Tech (WC-1)
HB – Buck Flowers, Georgia Tech (WC-2 [fb]; TM-2)