ICDD may refer to: International Centre for Diffraction Data, a nonprofit scientific organization Imperial Circus Dead Decadence, a Japanese symphonic black metal band Intellectual capital due diligence, part of operational due diligence International Center for Development and Decent Work, part of the University of Kassel ICD-D, self-optimising production systems in Integrative Production Technology for High-Wage Countries Institute for Civic Discourse and Democracy, an interdisciplinary, non-partisan organization formed by Kansas State University in 2004