Ottokár Prohászka (Hungarian: Prohászka Ottokár; 10 October 1858, Nyitra (today Nitra, Slovakia) – 2 April 1927, Budapest) was a Hungarian Roman Catholic theologian and Bishop of Székesfehérvár from 1905 until his death.
Prohászka was a prominent anti-Semite, and used literature as an outlet for his hostile opinions.