| MSSD | Manitou Springs School District 
| Others |
| MSSD | Markets And Structural Studies Division
| Others |
| MSSD | Master of Science in Sustainable Design
| Others |
| MSSD | Mean Squared Successive Differences
| Others |
| MSSD | Medical Staff Services Department
| Others |
| MSSD | Mediterranean Strategy For Sustainable Development
| Others |
| MSSD | Mercy Special Service District
| Others |
| MSSD | Michigan Spanish Speaking Democrats
| Others |
| MSSD | Mid Shelf Silt Deposit
| Others |
| MSSD | Milan Special School District
| Others |
| MSSD | Minneapolis Special School District
| Others |
| MSSD | Missouri Schools for the Severely Disabled
| Others |
| MSSD | Model Secondary School for the Deaf
| Others |
| MSSD | Mountain State Schoolbook Depository
| Others |