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.

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

The school accepts day/boarding, local, national and international students.

The recently refurbished boarding house is home to 29 boys.