- DIEC stands for Dubai International Exhibition Centre
- DIEC stands for Dhahran International Exhibitions Company (Saudi Arabia)
- DIEC stands for Diccionari de l’Institut d’Estudis Catalans (dictionary for Catalan language)
- DIEC stands for Direction Interdiocésaine de l’Enseignement Catholique (French: Interdiocesan Directorate of Catholic Education)
- DIEC stands for Defense Item Entry Control
DIEC