| Acronym | Term | Category |
| ZBB | Zero Base Budgeting (OMB Circular A115) | General |
| ZD | Zero Defects | General |
| ZI | Zonal Index | General |
| ZIP | Zone Improvement Plan (ZIP Codes) | General |
| ZIP+4 | 9 digit ZIP Code Plan | Medicare Beneficiary, Health Care |
| ZO | Zero Overpricing | General |
| ZST | Zone Standard Time | General |
| ZULU | Greenwich Mean Time | General |