Bystrík was a 11th-century Catholic bishop of the Diocese of Nitra, serving under King Stephen I of Hungary. Likely of Slavic or Hungarian descent, he may have been educated at Zobor Abbey. He is remembered as a martyr who died in 1046 near Pest during a pagan uprising led by Vatha. While his historical existence is debated by modern scholars, he remains a significant figure in regional religious tradition.