GDT

GDT may refer to:

Trails

 * Great Dividing Trail, in Victoria, Australia
 * Great Divide Trail, in the Canadian Rocky Mountains

Science and technology

 * Gas discharge tube
 * Gas Dynamic Trap, a Russian magnetic mirror used for fusion power research
 * Geometric dimensioning and tolerancing, GD&T
 * Global Descriptor Table, an x86 data structure
 * Global distance test, to compare proteins
 * Ground Data Terminal
 * GDT or Gerätedatentransfer, a medical data format; see xDT

Other uses

 * Ganvsig daighix tongiong pingimv, a romanization system for Taiwanese Minnan
 * Goal-directed therapy, in critical care medicine
 * Grand dictionnaire terminologique, an online terminological database
 * JAGS McCartney International Airport, Turks and Caicos Islands
 * Kungardutyi language
 * MaK GDT, a diesel railbus
 * Guillermo del Toro, director