Finchley Catholic Grammar School was founded in 1926 by the Monsignor Canon Clement Henry Parsons (1892–1980), parish priest of St. Alban’s Catholic Church, Nether Street, North Finchley. He founded the Challoner School (a fee-paying grammar school for boys who had not passed their 11+); as well as St. Alban’s Catholic Preparatory School as a feeder primary for the Grammar and Challoner schools. 1971 saw its two institutional forebears, Finchley Catholic Grammar School ("Finchley Grammar") and the Challoner School, merge to become Finchley Catholic High School). It was the sister school of the all-girls St. Michael’s Catholic Grammar School during the grammar school era.

The school started as a private initiative and parents were able to consider allowing their children to remain at school for longer. In a short time demand outgrew accommodation, the school had to extend. An appeal from the pulpit by Canon Parsons began the collection that by Christmas 1928 had produced enough money to purchase a building. Woodside Grange seemed an ideal site for the new school but it took the intervention of the Anglican Bishop of London to complete the purchase. The deal was finalised and the building taken over in September 1929.

Currently it has a total school capacity of 1200.

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