N3
- 2-manifold
- 3 nm process
- 3N (disambiguation)
- ATC code N03
- Haplogroup N (Y-DNA)
- Huanghai N3
- Japanese-Language Proficiency Test
- List of highways numbered 3
- N postcode area
- N road (disambiguation)
- N3 (Bangladesh)
- N3 (Calgary)
- N3 (NHS)
- N3 (South Africa)
- N3 motorway (Netherlands)
- N3 road (Belgium)
- N3 road (Gabon)
- N3 road (Ghana)
- N3 road (Ireland)
- N3 road (Oman)
- N3 road (Senegal)
- NDR Fernsehen
- Nagravision
- National Road 3 (Democratic Republic of the Congo)
- Nephritic syndrome
- Non-small cell lung carcinoma staging
- Notation3
- Omega-3 fatty acid
- Omskavia
- Preceptor N3 Pup
- Route nationale 3
- Spokane, Portland and Seattle Locomotive Roster
- Trinitrogen