| DEI | Deliverable End Item | In English | |
| DEI | Design Engineering Identification | In English | |
| DEI | Design Engineering Inspection | In English | |
| DEI | Design, Engineering, and Integration | In English | |
| DEI | Direction de l'Électronique et de l'Informatique | In French | → Computer science → Electronics |
| DEI | Dansk Esperanto-Institut = DEI | Dana Esperanto-Instituto | In Esperanto |
In Danish | → Organizations and associations |
| DEI | Dana Esperanto-Instituto = (look above) |
In Esperanto | → Organizations and associations |