- 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 stands for Data and Information Acquisition Plan (UK)
- DIAP stands for Datascope Improved Ascii Protocol (interface for programmatically retrieving vital signs readings)
DIAP