| CDEF | Californians Dedicated to Education Foundation 
| Others |
| CDEF | Cambodia Development and Education Fund
| Others |
| CDEF | Cebu Design Education Foundation
| Others |
| CDEF | Centrum Doradztwa Europejskiego i Finansowego
| Others |
| CDEF | Chinese Democracy Education Foundation
| Others |
| CDEF | Concept Design Execution and Finishing
| Others |
| CDEF | Constrained Directional Enhancement Filter
| Others |
| CDEF | Control Definition Function
| Others |
| CDEF | Cultural Development and Exchange Fund
| Others |
| CDEF | Cultural Development and Exchange Fund (Vietnam)
| Others |