Arnold Ipolyi (family name originally Stummer) (20 October 1823 – 2 December 1886) was a Hungarian Catholic bishop and historian.
He was next curate at Komáromszentpéter, in 1848 preacher at Bratislava, in 1849 spent a short time as tutor in the family of Count Palffy, and became in this year parish priest of Zohor.
Accompanied by Franz Kubinyi and Emerich Henszlmann, he made in 1862 a journey to Constantinople, where he discovered the remainder of the library of Matthias Corvinus.
Although the work won the prize offered by the Hungarian Academy of Sciences, Ipolyi afterwards withdrew it from the press.
He bequeathed the rest of his collection to Nagyvárad (today Oradea, Romania), for the purpose of founding a museum.