La Sainte Union Catholic School is a girls Roman Catholic secondary school based in Highgate in North London.

This teaching order was founded in 1826 by Father Jean-Baptiste Debrabant, a Belgian priest who felt that the future of the Catholic Church lay in the hands of the young women who would eventually bring up future generations of the faithful, declaring that "a Christian-based education offers sure hope for the future of religion and society".

[1] The school site is on Highgate Road/Croftdown Road, opposite Parliament Hill Fields.

It is one of the largest sixth form consortia in the Greater London area offering some 42 different AS and A2 courses, AGCEs, BTECs, NVQs and GCSE courses.

[citation needed] La Sainte Union has been featured in The Westminster Extra, The Camden New Journal and The Ham&High multiple times for their school plays and acting opportunities.