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 (that was formerly Iona Grammar School) for grades kindergarten through eight, which are located on separate and nearby campuses less than one mile apart on Stratton Road. Named for the Scottish island of Iona, the school was founded by the Congregation of Christian Brothers in 1916. An independent and private school without parochial affiliation, Iona is located within the Archdiocese of New York.