First period may refer to:
First Period architecture, an American architectural style originating between approximately 1626 and 1725 First menstrual bleeding at Menarche First period of the three periods in First period of chemical elements at Period 1 element First Period, a concept in Communist ideology discussed at Third Period First period as a school period
See also Period (disambiguation) First Intermediate Period of Egypt, a period in ancient Egyptian history from c. 2181 to 2055 BC First Palace Period, a period in Minoan architecture from c. 1925 to 1875 BC First Stadtholderless Period, a period in the history of the Dutch Republic from 1650 to 1672