Blessed János (Anasztáz) Brenner (17 December 1931 – 15 December 1957) was a Hungarian Roman Catholic priest and professed member of the Cistercian Order.
Brenner studied for the priesthood during a period of communist persecution of religious orders.
Communist authorities came to suspect him of being critical of their regime; his success as a youth chaplain made him a threat.
As a consequence, he was murdered by hired men who stabbed him 32 times and inflicted severe wounds to his head.
He died soon after having been hurled into a ditch in the woods.
The beatification took place on 1 May 2018 in Szombathely.