DFO

DFO may refer to:

Businesses and organizations

 * Dairy Farmers of Ontario, Canada
 * Department of Fisheries and Oceans, Canada
 * Direct Factory Outlet, Australia
 * German Women's Order (Deutscher Frauenorden or DFO), merged into the National Socialist Women's League

Science

 * 1,8-Diazafluoren-9-one, a chemical that reveals fingerprints
 * Deferoxamine, medication for iron overdose
 * Dispersive flies optimisation, a swarm intelligence algorithm

Other uses

 * Dungeon Fighter Online, a 2009 computer game