NSL
- 2020 Hong Kong national security law
- NS1 (disambiguation)
- NSEL (disambiguation)
- NSI (disambiguation)
- NSL Buses
- NSL Services Group
- Nanosphere lithography
- National Security Act (South Korea)
- National Security Law (disambiguation)
- National Security League
- National Soccer League (disambiguation)
- National Socialist League (United Kingdom)
- National Socialist League (United States)
- National Socialist Legion
- National Softball League
- National security letter
- Negro Southern League (disambiguation)
- Nepali Sign Language
- Netball Superleague
- Nicaraguan Sign Language
- Nintendo Switch Lite
- Northern Super League
- North–South Line (Singapore)
- Norwegian Sign Language
- Nottinghamshire Senior League
- Nuziveedu Seeds