St. George in Oshawa was founded in 1843 as a mission of St. John's, Whitby, and St. Paul's, Columbus.

They built their first permanent church building, a wood-frame structure at the northeast corner of King Street and Park Road, around 1847.

[2] A cairn marking the spot of the old church was unveiled by members of the parish on St. George's Day 1939.

[3] In 1864, the parish acquired the land on Park Road North which became St. George's Anglican Cemetery.

Charles R. de Pencier became rector in 1910 and began planning to construct a new church on the site of the existing rectory.

On June 12, 1919, sod was turned for a new church by the Duke of Devonshire, Governor General of Canada.

[1] In 1923, the Cowan family donated their home, constructed around 1858, located just north of the new church to be used a rectory.

[4] The mortgage was burned and the church was consecrated on September 12, 1944, by Derwyn Owen, Archbishop of Toronto and Primate of All Canada.

[4] St. George's Memorial Church was designed by Eden Smith in the Gothic Revival style.

The interior features an oak beam ceiling and Indiana limestone arches and columns.