| Acronym | Definition |
|---|
| ATDN➣Any Time Day or Night |
| ATDN➣AOL Transit Data Network |
| ATDN➣Adult Training and Development Network |
| ATDN➣AIDS Treatment Data Network (est. 1988; New York, NY) |
| ATDN➣Advanced Technology Demonstration Network (Darpa) |
| ATDN➣Adult Training and Development Network (Capitol Region Education Council; Connecticut) |
| ATDN➣Amazon Tree Diversity Network (network for data and information sharing on tree diversity in the Amazon) |