- DIIP stands for Direct Interrupt Identification Port
- DIIP stands for Dokument Identifikacije Investicijskega Projekta (Slovenian: Document Identification of the Investment Project)
- DIIP stands for Defense Inactive Item Program
- DIIP stands for Database on International Intellectual Property Crime (Interpol)
- DIIP stands for Downtown Infrastructure Improvement Project (Sea Bright, NJ)
- DIIP stands for Defence Information Infrastructure Programme (UK)
DIIP