SDD

SDD may refer to:

Computing

 * Software Design Description (IEEE 1016–2009), a standard that specifies the form of the document used to specify system architecture and application design in a software-related project
 * Software Design Document, a written outline of the development of a course or a description of a software product


 * Solution Deployment Descriptor, a proposed OASIS standard for software deployment, configuration and maintenance
 * Software Design and Development, an HSC subject in NSW that details the basics of designing and developing software applications
 * Syntax-Directed Definition - a context-free grammar with attributes and rules
 * Sentential Decision Diagram, a formalism in knowledge compilation and artificial intelligence

Finances

 * SDD, for SEPA Direct Debit, a payment system in the Single Euro Payments Area in Europe
 * SDD, ISO code for the Sudanese dinar, the currency of Sudan 1992–2007, now replaced by the Sudanese pound

Science

 * Sulfadimidine, an antibiotic whose abbreviations include SDD
 * Shared delusional disorder, a psychiatric syndrome
 * Silicon drift detector, a p-n junction-based detector for ionizing radiation, such as for X-rays
 * Seasonal deficit disorder, another name for seasonal affective disorder
 * Symmetric diagonally dominant matrix systems in mathematics
 * Selective decontamination of the digestive tract in medicine