St. George's School of Montreal is an independent school in Montreal, Quebec, Canada founded in 1930. It consists of two campuses: the elementary school campus in Westmount, Quebec, and the high school campus in Montreal just a 15-minute walk from Beaver Lake and Mount Royal Park. The school is a co-educational, non-denominational day school, where students do not wear school uniforms, except during physical education class. St. George's School of Montreal is a member of The Quebec Association of Independent Schools (QAIS), The Canadian Accredited Independent Schools (CAIS), and The National Association of Independent Schools (NAIS).

St. George's was founded by a small group of parents who, inspired by the movement for progressive education, rejected the authoritarian ways associated with conventional education. They believed that learning should be a natural and enjoyable activity related to the developmental stages and needs of the child. During most of the 20th century, it was notable for being one of the most avant-garde, liberal and innovative schools in the province of Quebec, largely due to its child-centred philosophy (which was quite exceptional in the 1930s, and unique in Montreal). The school's pedagogy is guided by its Founding Principles: (1) The child should have abundant opportunity for creative expression; (2) Adapt education to the differences of the individual child; (3) Health must come first; (4) Group-consciousness and social-mindedness should be developed; (5) Learning comes from doing; (6) The classroom should be freed from unnatural restraints.

St. George's is a day school, however there is a family boarding program for international students. The annual tuition fees for attending St. George's range from $18,568 to $22,889 for non-international students and up to $52,037 for new international boarding students. As the school receives subsidies from the Quebec government from Grades 7 to 11, all students attending the high school section are required to have a certificate of eligibility allowing them to attend government-funded English schools in accordance with Bill 101.