Zlaudus from the kindred Ják (Zelandus, Zeland or Zaland; died c. 1262) was bishop of Veszprém in the Kingdom of Hungary from 1245 to his death.

He originated from the Transdanubian branch of the gens Ják as the son of Martin (Márton), ispán of Vas County.

He was elected bishop of Veszprém in 1245, however King Béla IV refused to recognize the appointment, because Zlaudus did not ask for his endorsement.

Zlaudus built the Tátika Castle in the Keszthely Mountain, near Zalaszántó.

He left his fortune to the Roman Catholic Church, however his genus acquired the castle.