| SSDD | Same S Different Day 
| Others |
| SSDD | Same S*** Different Day
| Others |
| SSDD | Same S***, Different Day
| Others |
| SSDD | Same Saying, Different Dictionary
| Others |
| SSDD | Same Sh Different Day
| Others |
| SSDD | Same Sh*t Different Day
| Others |
| SSDD | Same Shirt Different Day
| Others |
| SSDD | Same Stuff Different Day
| Others |
| SSDD | Same Stuff, Different Day
| Others |
| SSDD | Same Surface Different Deep
| Others |
| SSDD | Sapientia Sapenti dono data
| Others |
| SSDD | Self Similarity Driven Demosaicking
| Others |
| SSDD | Sigmoid Sinus Diverticulum Dehiscence
| Others |
| SSDD | Single Sided Double Density
| Others |
| SSDD | Social Sciences Doctoral Dissertation
| Others |
| SSDD | Software System Design Document
| Others |
| SSDD | Space Systems Development Department
| Others |
| SSDD | Staff and Student Development Department
| Others |
| SSDD | Steal S Do Drugs
| Others |
| SSDD | Steal S*** Do Drugs
| Others |
| SSDD | Steal Sh*t Do Drugs
| Others |
| SSDD | Sub-System Design Document
| Others |
| SSDD | Subsystem Design Description
| Others |
| SSDD | System Segment Design Document
| Others |
| SSDD | System Subsystem Design Description
| Others |
| SSDD | System/ Segment Design Description ( MIL-STD-498)
| Others |
| SSDD | System/ Segment Design Document
| Others |
| SSDD | System/Segment Design Description
| Others |
| SSDD | System/Segment Design Document
| Others |
| SSDD | System/Sub-system Design Description (MIL-STD-498)
| Others |
| SSDD | System/Subsystem Design Description
| Others |