SDD
- SEPA Direct Debit
- Seasonal affective disorder
- Selective digestive decontamination
- Sentential Decision Diagram
- Shared delusional disorder
- Silicon drift detector
- Software Design Description
- Software Design Document
- Software Design and Development
- Solution Deployment Descriptor
- Spec-driven development
- Sudanese dinar
- Sulfadimidine
- Syntax-Directed Definition