SDT

SDT may refer to be:


 * Scottish Dance Theatre
 * Self-determination theory
 * Service Description Table
 * Sigma Delta Tau
 * Signal detection theory
 * Social dominance theory
 * Sonodynamic therapy
 * Special Duty Team
 * Specially Designated Terrorist
 * Shizuoka Daiichi Television
 * Second demographic transition
 * San Diego Trolley