Ján Vályi or János Vályi (22 September 1837 – 19 November 1911) was a Slovak Greek Catholic hierarch.
He was the bishop of Slovak Catholic Eparchy of Prešov from 1883 to 1911.
Born in Vencsellő, Austrian Empire (present day – Hungary) in 1837, he was ordained a priest on 26 October 1865.
He was appointed as the Bishop of Eparchy by the Holy See on 15 March 1883.
This biographical article about a Slovak Greek Catholic bishop is a stub.