[Index To Leagues Separated By State/Nation]
O' :
[O'Mealley Trophy (Victoria)]
[O'Shea Cup (Victoria)]
[O'Shea Trophy (Victoria)]
OA :
[Oatlands District FA (Tasmania)]
[Oatlands District Football Competition (Tasmania)]
OC :
[Oceania Cup (International)]
OK :
[Oktoberfest Cup (Germany)]
OL :
[Old Scholars FA (Tasmania)]
[Old West Wimmera FL (Victoria - Placeholder league name)]
OM :
[Omeo DFL (Victoria)]
ON :
[Ongerup FA (WA)]
[Ontario AFL (Canada)]
OR :
[Orbost DFL (Victoria)]
OS :
[Osborne FA (NSW)]
OT :
[Otway FA (Victoria)]
OU :
[Outback Steakhouse AFL (USA)]
[Ouyen & DFA (Victoria - To 1945)]
[Ouyen DFL (Victoria - c.1946-96)]
[Ouyen DFL (Victoria - To 1945)]
[Ouyen Junior DFL (Victoria)]
[Ouyen-Murrayville FL (Victoria)]
OV :
[Ovens & King FL (Victoria)]
[Ovens & Murray FA (Dual - NSW, Victoria)]
[Ovens & Murray FL (Victoria)]
[Ovens Valley FA (Victoria)]