| IDDP | Iceland Deep Drilling Project 
| Others |
| IDDP | Icelandic Deep Drilling Project
| Others |
| IDDP | Identify Differentiate Determine Predict
| Others |
| IDDP | Iglesia de Dios Pentecostal
| Others |
| IDDP | Impaired Driving Deterrence Program
| Others |
| IDDP | Individual Differences and Developmental Psychopathology
| Others |
| IDDP | Industrial Discovery and Development Partnerships
| Others |
| IDDP | Institute Degree Designation Program
| Others |
| IDDP | Institute for Didactic Development and Psychology
| Others |
| IDDP | Instrument Driver Developer Program
| Others |
| IDDP | Integrated Dairy Development Project
| Others |
| IDDP | Integrated Drylands Development Programme
| Others |
| IDDP | Intellectual Disability Diversion Program
| Others |
| IDDP | Intensive Dairy Development Programme
| Others |
| IDDP | Intercollegiate Development Discussion Panel
| Others |
| IDDP | International Day of Disabled Persons
| Others |
| IDDP | International Dentist Degree Program
| Others |
| IDDP | International Design and Decorating Professional
| Others |
| IDDP | International Double Degree Program
| Others |