Hiện nay

1. National Institute on Aging
2. Next Instruction Address
3. Network Interface Adapter
4. NOVA Interface Adapter
5. National Institute of Accountants
6. Nicotinic acid - also NA, NIC, NiAc, NAc and NIC-A
7. National Insurance Administration
8. National Intelligence Agency
9. Neuronal impulse activity
10. Network Indicate Address
11. National Irrigation Administration
12. Neuroleptic-induced akathisia
13. Naloxone-induced analgesia
14. National Institute of Aging
15. Net Internal Area
16. Network Information Access
17. Nias
18. Nitrate reductase - also NR, Nar, niaD and NiR