| SAO | Shitty Add On 
| Others |
| SAO | Single Action Only
| Others |
| SAO | Single Association Object
| Others |
| SAO | Situation Action Outcome
| Others |
| SAO | Smithsonian Astrophysical Observatory
| Others |
| SAO | Smithsonian Astrophysics Observatory
| Others |
| SAO | Smooth Approach Orifice
| Others |
| SAO | Society of Antiquaries of the West
| Others |
| SAO | Software Association of Oregon
| Others |
| SAO | South African Origin
| Others |
| SAO | Southern Association of Orthodontists
| Others |
| SAO | Special Access Office
| Others |
| SAO | Special Agreements Officer
| Others |
| SAO | Special Astrophysical Observatory
| Others |
| SAO | Stabilised Aqueous Ozone
| Others |
| SAO | Stabilized Aqueous Ozone
| Others |
| SAO | Stacy Adams Outdoors
| Others |
| SAO | Staff Action Officer
| Others |
| SAO | Stand As One
| Others |
| SAO | Standard Adep Output
| Others |
| SAO | Standard Application Online
| Others |
| SAO | Standards Are Overrated
| Others |
| SAO | State Accounting Office
| Others |
| SAO | State Audit Office
| Others |
| SAO | State Auditor's Office
| Others |
| SAO | Stay Away Order
| Others |
| SAO | Store Assortment Online
| Others |
| SAO | Student Achievement Officer
| Others |
| SAO | Student Activities Office
| Others |
| SAO | Student Affairs Office
| Others |
| SAO | Subject access office
| Others |
| SAO | Summer Academic Orientation
| Others |
| SAO | Surface Aviation Observation
| Others |
| SAO | Survivor Assistance Officer
| Others |
| SAO | Swinburne Astronomy Online
| Others |
| SAO | Sword Art Online
| Others |
| SAO | University of St, Andrews - 1
| Others |
| SAO1 | Special Artificer (optical) 1st Class Petty Officer
| Others |
| SAO2 | Special Artificer (optical) 2nd Class Petty Officer
| Others |
| SAO3 | Special Artificer (optical) 3rd Class Petty Officer
| Others |
| SAOA | Saginaw Athletic Officials Association
| Others |
| SAOA | South African Optometric Association
| Others |
| SAOA | South African Orthopaedic Association
| Others |
| SAOA | South Australian Ornithological Association
| Others |
| SAOA | Southeastern Athletic Officials Association
| Others |
| SAOA | Stichting Aanpak Overlast Amsterdam
| Others |
| SAOA | Sword Art Online Award
| Others |
| SAOC | Rio Cuarto/Area de Material, Argentina
| Others |
| SAOC | s Association of Canada
| Others |
| SAOC | Schiphol Airline Operators Committee
| Others |