ITD

ITD may refer to:
 * Income Tax Department, Government of India's department for direct taxes
 * Idaho Transportation Department
 * Impedance threshold device, a valve used in cardiopulmonary resuscitation (CPR)
 * Information Technology Directorate (formerly the Information Engineering Directorate) of the United Kingdom government Department of Trade and Industry
 * Inter-type declaration, a feature of Aspect-oriented computer programming.
 * Interaural time difference, the difference in arrival time of a sound between two ears
 * Internal tandem duplication, a form of mutation (see gene duplication and tandem exon duplication)