DST is daylight saving time, a seasonal adjustment to civil time.

DST may also refer to:

Academia

• Delta Sigma Theta, an American organization of college-educated women
• Doctor of Sacred Theology, highest qualification in Roman Catholic theology

Businesses

• DST Systems, an American technology company
• Digital Signature Trust Company, a cryptographic root certificate authority (now owned by IdenTrust)
• Digital Sky Technologies, a Russian investment firm

Government, law and military

• Defence School of Transport, Leconfield, Yorkshire, England
• Defence Science and Technology Group, ancillary Australian national security agency
• Delaware statutory trust
• Department of Science and Technology (South Africa)
• Department of Science and Technology (India)
• Direction de la surveillance du territoire, defunct French intelligence agency
• Direction générale de la surveillance du territoire, Moroccan intelligence agency

Mathematics

• Dempster–Shafer theory, in probabilistic logic, a model of uncertainty
• Descriptive set theory, in logic
• Discrete sine transform, a Fourier transform variant
• Dynamical systems theory, related to chaos theory

Science

• Descending subtraction task, a clinical cognitive test
• Developmental systems theory, an evolutionary biology framework
• Dexamethasone suppression test, in endocrine medicine, a measure of adrenal gland function
• Dialogical self theory, in psychology
• Disturbance storm time index, in aeronomy, a measure of space weather near Earth
• Dystonin, a protein relevant to neurology and its related human gene

Technology

• Data Storage Technology, a 1992 magnetic-tape data-storage format
• Decision support tool, see Decision support system
• Deep Space Transport, a crewed interplanetary spacecraft concept
• Digital signature transponder, Texas Instruments' RFID device
• Direct Stream Transfer, a lossless audio compression format used by SACD
• Douglas Sleeper Transport, a 1940s aircraft model (precursor to the Douglas DC-3)
• Drill stem test, in oil exploration

See also

• DS&T

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