North London Grammar School is a non-denominational private secondary and preparatory school for girls and boys aged 7–18 located in Hendon, Barnet, a suburb of North London, England.

NLGS was formerly the Wisdom School, established in Tottenham, Haringey in 2006. The expanded school, which opened in September 2014, offers a 50,000 square foot site versus the former 6000 square foot Tottenham site.

The school was rated Outstanding in all categories according to Ofsted's 2018 report.

The school was rated Inadequate according to Ofsted's 2022 report.

The school has a capacity for 330 students and space for 30 boarding students. The boarding site is located within the school building. The school accepts day/boarding, local, national and international students.

The recently refurbished boarding house is home to 29 boys. They are of mixed year groups, with their number of boarders ranging from year 8 to year 11. The boarding is accredited by the Boarding Schools Association.

• North London Grammar School
• Boarding Schools Association