Maria Elizabeth Ridulph (March 12, 1950 – c. December 1957) was a seven-year-old girl who disappeared from Sycamore, Illinois on December 3, 1957. Her remains were found almost five months later in a wooded area near Woodbine, Illinois, approximately 120 miles from her home. Maria was last seen by her friend on her neighborhood corner of Center Cross Street and Archie Place with an unknown man in his early twenties who called himself "Johnny".