NSW is a short form name for New South Wales, an Australian state.
NSW may also refer to:
- King of Egypt
- National Herbarium of New South Wales, by Index Herbariorum code
- Naval Strike Wing of the UK's Royal Navy Fleet Air Arm
- Navut language of Vanuatu
- Newman–Shanks–Williams prime, a class of number in mathematics
- Nintendo Switch, a hybrid (home and handheld) video gaming console
- United States Naval Special Warfare Command, a military commando force