St. Malachi Church is a historic Irish Roman Catholic mission church on St. Malachi Road in rural Londonderry Township, Chester County, Pennsylvania. It is a mission of Our Lady of Consolation of Parkesburg. The church with its adjoining cemetery was added to the National Register of Historic Places (NRHP) in 1985. The church is remarkable for its simplicity, resembling a Quaker meeting house more than a Catholic parish church. It is a rectangular one story stone stucco-covered building.