Whetstone is a suburb of London, in the London Borough of Barnet, bearing the postcode N20. It is served by an Underground station called Totteridge and Whetstone. Whetstone is around 7.8 miles North of Charing Cross and is a settlement in the London Borough of Barnet, previously part of the Borough of Finchley prior to the 1960s. The combined areas of Totteridge and Whetstone was, at the outset of the 21st century, found to be the 63rd-richest of the more than 9,000 wards of the United Kingdom.

The London Borough of Barnet is a local authority area on the northern outskirts of London. The borough was formed in 1965 from parts of the ceremonial counties of Middlesex and Hertfordshire. It is the second largest London borough by population with 389,344 inhabitants as of 2021, also making it the 17th largest district in England. The borough covers an area of 86.74 square kilometres (33 sq mi), the fourth highest of the 32 London boroughs, and has a population density of 45.8 people per hectare, which ranks it 25th.