**'FL' is an abbreviation used for 'Football League'**

Professional
NFL - National Football League
WLAF - World League of American Football
Arena FL - Arena Football League
af2 - arenafootball2

CFL - Canadian Football League
USFL - United States Football League
WFL - World Football League

NIFL - National Indoor Football League

PIFL - Professional Indoor Football League

IPFL - Indoor Professional Football League

Indoor FL - Indoor Football League

PSFL - Professional Spring Football League

Continental FL - Continental Football League

WAFL - Women's American Football League

WPFL - Women's Pro Football League

NWFL - National Women's Football League

SANFL - South Australian National Football League

GASA - Gridiron Association of South Australia

Semipro/Junior Football
SEFL - Southeast Football League
Mid-Con FL - Mid-Continent Football League
BCJFA - British Columbia Junior Football Association
OFC - Ontario Football Conference
PFC - Prairie Football Conference
Intl FL - International Football League

Mich FL - Michigan Football League

Mid-Am FL - Mid-America Football League

NFA - National Football Association

SCFL - South Central Football League
AFL-Oklahoma - American Football League of Oklahoma

BCAFL - British Collegiate American Football League

EFAF - European Federation of American Football

Australian FL - Australian Football League

APFL - Asia Pacific Football League