NCHS
- Casper, Wyoming
- Liberty High School (Houston, Texas)
- Nan Chiau High School
- Naperville Central High School
- National Center for Health Statistics
- Natrona County High School
- Nebraska City High School
- Nebraska City, Nebraska
- New Canaan High School
- New Canaan, Connecticut
- New Castle High School (disambiguation)
- Newton, North Carolina
- Newton-Conover High School
- Normal Community High School
- Normal, Illinois
- North Central High School (disambiguation)
- North County High School (disambiguation)
- Northwest Christian High School (Lacey, Washington)