Ding Dong School, billed as "the nursery school of the air", was a half-hour children's TV show which began on WNBQ-TV (now WMAQ-TV) in Chicago, Illinois a few months before its four-year run on NBC (albeit still produced in the WNBQ studios). It is the earliest known preschool series to be produced in the United States, predating Romper Room by a year.