OSFA

OSFA may refer to:
 * Ozark Science Fiction Association (St. Louis, Missouri)
 * Office of Student Financial Aid (or Financial Assistance), at institutions of higher education
 * Oklahoma State Firefighters Association
 * Old Scholars Football Association
 * One size fits all
 * One Size Fits All (Frank Zappa album), a 1975 album by Frank Zappa
 * Orthopedic Surgery of the Foot and Ankle