Gedaliah ibn Yahya ben Joseph (Hebrew: גדליה אבן יחיא בן יוסף; c. 1515 – 1587) was a 16th-century Italian Talmudist of the prominent Yahya family chiefly known for his chronology of the Bible, The Chain of Oral Tradition (Hebrew: שלשלת הקבלה, romanized: Shalsheleṯ haqabbālā).
He was later expelled with other Jews by Pope Pius V, and suffering a loss of 10,000 gold pieces, he went to Pesaro, and thence to Ferrara, where he remained till 1575.
Another theory "indicates that Gedaliah did not die in Alexandria, Egypt, but in Alessandria, a town sixty to seventy miles northwest of Genoa, Italy, along the road to Turin.
This work is not without defects, having suffered either because of the author's itinerant mode of life or through faulty copying of the original manuscript.
Gedaliah was the alleged author of twenty-one other works, which he enumerates at the end of his Chain and which are mentioned also in Isaac ben Jacob Benjacob's Oṣar ha-Sefarim.