Ulrich I, Duke of Brno, Moravian ruler
Ulrich I, Duke of Brno (Czech: Oldřich Brněnský, German: Ulrich von Brünn, Latin: Udalricus Brunensis; 11th century – 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, Duke of Bohemia (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.

He had long ruled over Moravia (as diarch in Brno) for 21 years, once interrupted by illegitimate regency: (1099–1100 by Bretislaus II)

By his marriage to an unknown princess, he probably had two children:

Wratislaus of Brno, Duke of Brno from 1125 to 1129 and from 1130 to his death in 1146

Nadia (?),(or Nadine, original Надія, Czech Naděj)He was succeeded legitimately as prince of Brno by his son Wratislaus of Brno.