Dark Matter: Theory Overview

A plethora of data from a variety of sources shows that cold dark matter (CDM) must exist in the universe. CDM cannot be accommodated in the Standard Model of particle physics. I review a variety of theoretical candidates for CDM, and discuss prospects for their detection. I focus additional attention on the case of the lightest neutralino in supersymmetric models of particle physics, and prospects for direct, indirect and collider detection of neutralino dark matter.