The Church of St Gregory the Great is a Roman Catholic parish located on the Upper West Side of Manhattan, New York City. The parish is part of the Archdiocese of New York. The church building, designed by architect Elliott Lynch, contains the church and parish offices on the ground floor with St. Gregory the Great Parochial School on the next two floors above, the final fourth floor is occupied by the rectory. The address of the church is 144 West 90th Street, New York, New York 10024-1202; the address of the school is 138 West 90th Street, New York, NY 10024.