Ulrich I, Duke of Brno (Czech: Oldřich Brněnský, German: Ulrich von Brünn, Latin: Udalricus Brunensis; died 5 January 1113) was the Duke of Moravia for twenty one years - between 1092 and 1113. He was the first son and successor of Conrad I, of Brno (died 1092) and Wirpirk of Tengling. He did not succeed as half ruler of Moravia (diarch), for all half of Moravia (the west one) as his father Conrad I, but Brno was divided into two parts: Brno and Znojmo and Ulrich was co-ruler in this part with his brother Luitpold of Znojmo. Both brothers together established a benedictine cloister and its St. Procopius Basilica in Třebíč and prepared as mausoleum for Brno-Znojmo branch House of Přemyslid.