| Rank | Abbreviation | Meaning |
|---|
| ***** | SMSO | State Military Support Office
| |
| ***** | SMSO | Security Management System Online
| |
| **** | SMSO | Sekolah Menengah Sayyidina Othman
| |
| **** | SMSO | Sequential Multipliers with Serial Output
| |
| **** | SMSO | Spinor Molecular Symmetry Orbital
| |
| **** | SMSO | Saudi Medical Site Online
| |
| *** | SMSO | Senior Maintenance Staff Officer
| |
| *** | SMSO | Study of Mathematics and Science Opportunity
| |
| *** | SMSO | Survey of Mathematics and Science Opportunity
| |
| *** | SMSO | South Melbourne Symphony Orchestra
| |
| *** | SMSO | Space and Missile Systems Organization
| |
| ** | SMSO | Saudi Medical Students Online
| |
| * | SMSO | State Military Support Officer
| |
| * | SMSO | Senior Management Services Officer
| |
| * | SMSO | Stowarzyszenie Mlodego Spoleczenstwa Obywatelskiego
| |
| * | SMSO | Senter mot seksuelle overgrep
| |
| * | SMSO | Southern Mississippi Symphony Orchestra
| |
| * | SMSO | Southwest Michigan Symphony Orchestra
| |
| * | SMSO | Street Maintenance and Sanitation Officials
| |
| * | SMSO | Santa Monica Symphony Orchestra
| |