IDD or Idd may refer to:
Academia
International Development Department, an academic department on poverty reduction at the University of Birmingham Integrated Dual Degree program
Locations Idd, a parish and former municipality in Halden, Norway
Observances International Dance Day International Day of Democracy
People with the surname
Dolal Idd, an American killed in an exchange of gunfire with Minneapolis police
Science and technology Insulin-dependent diabetes, called diabetes mellitus type 1 Interictal dysphoric disorder International direct dialing, in telephony Iodine deficiency disorders, commonly used when discussing IDD eradication programs IDD, the electric current in the drains of a CMOS circuit Interface Design Description, in the military software standard MIL-STD-498 Intellectual Development Disorder Integration Driven Development