| DIAP | Deutsche Internationale AbiturprÜfung | Deutsche Internationale AbiturprÜfung |
| DIAP | diapason | 和谐 |
| DIAP | Defense Information Assurance Program | 国防信息保障计划 |
| DIAP | Datascope Improved Ascii Protocol (interface for programmatically retrieving vital signs readings) | Datascope改进的Ascii协议（用于编程检索生命体征读数的接口） |
| DIAP | Departamento de Investigação E Acção Penal (Portugese: Department of Investigation and Prosecution) | Departamento de Investigação E Acção Penal (Portugese: Department of Investigation and Prosecution) |
| DIAP | Drug Interdiction Assistance Program | 禁毒援助计划 |