Siad

Siad or SIAD may refer to:
 * Siad (name)
 * Șiad, a village in Craiva, Romania
 * Self-injury Awareness Day, a grassroots annual global awareness event on March 1
 * Sierra Army Depot, California, United States
 * Syndrome of inappropriate antidiuresis, a syndrome characterized by excessive unsuppressible release of antidiuretic hormone
 * Surrey Institute of Art & Design, University College in the United Kingdom
 * Supersonic Inflatable Aerodynamic Decelerator (SIAD), the main part of Low-Density Supersonic Decelerator