| Abbreviation | Definition |
|---|---|
| AFPR | Amateur Football Power Ratings |
| AFS | Association of Football Statisticians |
| AFSO | Afghan Football Support Organization |
| AFVH | American Football Verband Hessen |
| AFWL | American Football Womens League |
| AFWL | American Football Women's League |
| AIAF | Association Internationale des Avocats du Football |
| AIF | American Indoor Football |
| AIFA | American Indoor Football Association |
| AIFF | All India Football Federation |
| AIFS | Associazione Italiana Football Sala |
| AJFL | Alberta Junior Football League |
| AJFL | Andover Junior Football League |
| AJFL | Anglesey Junior Football League |
| ALAW | All Leeds Aren’t We |
| ALPF | American League of Professional Football |
| AMFA | All Manipur Football Association |
| AMFA | Arvada Midget Football Association303 |
| AMFL | Adelaide Metropolitan Football League |
| ANFA | All Nepal Football Association |