- NCDC
- Naval Underwater Warfare Center
- Naval Surface Warfare Center
- NIH
- Nonproliferation Center
- newsroom
- Northern Baptist Convention
- Nauclea
- Nicotiana
- Nicandra
- Nepeta
- novel
- notable
- nonfictional
- newspeak
- nominal head
- nether region
- nestle
- niqab
- nervus facialis
- neuroplasty
- nose job
- neck and neck
- nip in the bud
- nipa fruticans
- nominal value
- nitrohydrochloric acid
- nitric acid
- nitrous acid
- nimbus
- nonextant
- nonpartisanship
- non_discrimination
- neglect
- nonaccomplishment
- nonachievement
- nonpayment
- nonconformance
- nonconformity
- nonremittal
- nonstarter
- nuclear fusion reaction
- nuclear reaction
- niggle
- novelty
- nod off
- nuclear_powered ship
- nucleated
- Nepeta cataria
- New Zealand spinach