Engelschalk II was the margrave (comes terminalis, "frontier count") of the March of Pannonia in the late ninth century in opposition to Aribo.
In his day, the march orientalis corresponded to a front along the Danube from the Traungau to the Szombathely and Raba rivers and including the Vienna basin.
He led his brothers and cousins in rebellion against the new margrave Aribo when they were not accorded the succession to their fathers in 871.
In 893, Arnulf did regrant Engelschalk some power in Pannonia, but he offended the magnates of Bavaria and they conspired against him.
His brother William immediately connived with Svatopluk, but the Bavarian aristocracy began to purge the court of Wilhelminers.