The Cistercian numeral system is a numeral system that was used by the Cistercian order of monks in the 13th to 15th centuries of the Middle Ages, and has been used sporadically since then. It allowed writing numbers from 1 to 9999 as single compound characters.

The system uses a horizontal or vertical stave as its base. Either side of either end of the stave may carry a digit from 1 to 9. The place value of the digit is determined by its location.