Iona Preparatory School (commonly known as Iona Prep) is an independent, Roman Catholic, all-male, college preparatory school located in the north end of New Rochelle, New York, in suburban Westchester County. Iona Prep consists of the Upper School for Grades 9 through 12 and the Lower School (formerly Iona Grammar School) for Grades kindergarten through eighth grade. The primary and secondary schools are located on separate and nearby campuses less than a mile apart on Stratton Road. Named for the Scottish island of Iona, the school was founded in 1916 by the Congregation of Christian Brothers. Iona is a privately owned independent school without parochial affiliation and is located within the Archdiocese of New York.