Posted in Government & Military, Information Technology, Organizations, Science DIAP stands for Departamento de Investigação E Acção Penal (Portugese: Department of Investigation and Prosecution) DIAP stands for Defense Information Assurance Program DIAP stands for Development and Institutional Advancement Program (Association of Theological Schools) DIAP stands for Drosophila Inhibitor of Apoptosis Protein DIAP stands for Deutsche Internationale Abiturprüfung DIAP stands for Democracy in America Project DIAP