St. Mary's Town and Country School was an independent, non-denominational, co-educational progressive day and boarding school, founded in Belsize Park, London in 1937. It closed at the end of 1982.

The school was owned and run by Mrs Elisabeth Paul PhD (née Selver), assisted by her husband Henry Paul, Elisabeth Paul's father David was a former rabbi in Darmstadt, Heinz Paul was a German Protestant. Both emigrated in 1936 from Berlin to London where in 1937 they bought the school, originally called St. Mary's School, at 1 Belsize Avenue. The school curriculum was biased toward the learning of languages and the arts from an early age, and the pupils, aged 4 to 18 years, were primarily the children of artists, musicians, writers, film producers and actors.