D4
| Acronym | Definition |
|---|---|
| D4 | Dillinger Four (band) |
| D4 | Delta4 (work process and performance improvement system for sales organizations) |
| D4 | 4-Sided Die (gaming) |
| D4 | Fourth Generation Channel Bank (48 Voice Channels on 2 T-1s or 1 T-1c) |
| D4 | Degrade, Disrupt, Deny, Destroy |
| D4 | Decontamination, Dismantlement, Deactivation, and Decommissioning (US DoE) |
| D4 | MI-5 Special Services |