| DFO | 1,8-Diazafluoren-9-one 
| Others |
| DFO | D In Front Of
| Others |
| DFO | Dairy Farmers of Ontario
| Others |
| DFO | Dairy Farmers of Ontario (created August 1, 1995 supplanting the OMMB)
| Others |
| DFO | Danube Fashion Office
| Others |
| DFO | Dark Forcers Organization
| Others |
| DFO | Dartmouth Flood Observatory
| Others |
| DFO | Data Flow Object
| Others |
| DFO | Data Flow Operator
| Others |
| DFO | Date file opened
| Others |
| DFO | Degenerate Flame Off
| Others |
| DFO | Dell Factory Outlet
| Others |
| DFO | Dennys Food Organization
| Others |
| DFO | Denver Field Ornithologists
| Others |
| DFO | Department of Fisheries and Oceans
| Others |
| DFO | Department of Fisheries and Oceans (government of Canada)
| Others |
| DFO | Derivative Free Optimization
| Others |
| DFO | Derived Format Object
| Others |
| DFO | Designated Federal Officer
| Others |
| DFO | Designated Federal Official
| Others |
| DFO | Designated Firearm Officer
| Others |
| DFO | Designer Factory Outlets
| Others |
| DFO | Designer Furniture Outlet
| Others |
| DFO | Desktop Flickr Organizer
| Others |
| DFO | Diesel Fuel Oil
| Others |
| DFO | Diesel Fuel Only
| Others |
| DFO | Digital Fuel Optimization
| Others |
| DFO | Digital Fuel Optimizer
| Others |
| DFO | Dining Facility Operation
| Others |
| DFO | Direct Factory Outlet
| Others |
| DFO | Direct Factory Outlets
| Others |
| DFO | Direct Femmebogue Observation
| Others |
| DFO | Direct Focus Online
| Others |
| DFO | Disaster Field Office
| Others |
| DFO | Dispatcher Failover
| Others |
| DFO | Distillate Fuel Oil
| Others |
| DFO | District forest officer
| Others |
| DFO | District Forest Offices
| Others |
| DFO | Division of Financial Operations
| Others |
| DFO | Divisional Forest Officer
| Others |
| DFO | Don't Fall Over
| Others |
| DFO | Don't Flip Out
| Others |
| DFO | Don't Freak Out
| Others |
| DFO | Done Fell Out
| Others |
| DFO | Done Fell Over
| Others |
| DFO | Donut Field Officer
| Others |
| DFO | Doppel Fallstromvergasern
| Others |
| DFO | Drunk And Fell Over
| Others |
| DFO | Dual Exhaust Option
| Others |
| DFO | Dual Filter Oscillator
| Others |
| DFO | Dumb F***in Ozzie
| Others |
| DFO | Dungeon Fighter Online
| Others |