The diocese was created as the first one on the territory of present-day Slovakia around 880, during the time of Great Moravia. Its first bishop was the Saint Methodius. Its destiny after the fall of Great Moravia isn't known. It was re-established in 1105 as part of the ecclesiastical province of Esztergom in the Kingdom of Hungary. In 1977, it was taken from the Archdiocese of Esztergom and attached into the newly established Diocese of Trnava. Before the reorganization in 2008, it was situated in the western parts of the Trenčín and Žilina regions with a strip connecting it to the city of Nitra. It had an area of 5,321 km² and a population of that area was 838,861 of which around 84% were of Catholic faith. On 14 February 2008, the territory of the diocese was reorganized. The diocese lost northern parts to the newly created Diocese of Žilina, but gained territory around the "strip" and southern parts from the Archdiocese of Bratislava-Trnava.
Viliam Batan or Vilmos Batthyány Born into the Batthyány, noble family of Hungary, the son of Count Batthyány de Németújvár and Countess Sigismund Erdődy. He studied philosophy and theology at the University of Innsbruck and Rome and received a doctorate in canon law. He was ordained priest in 1894 and was connon of Nitra, Auxiliary Bishop of Nitra ; in 1911 he became Bishop of Nitra. After the establishment of Czechoslovakia in 1918 Hungarian Church hierarchy were perceived as a threat to national interests of the new republic and demanded to resign. Batan as a lawyer, tried to oppose the demands, however he was unsuccessful and several Hungarian prelates were escorted to the bridge over the Danube in Esztergom. Batan left shortly after.
Karol Kmeťko
was a Roman Catholic cleric, Bishop of Nitra, and the author of religious books and articles. Karol Kmeťko was one of the signatories of the Martin Declaration of 30 October 1918. From 1918 to 1920 he was a member of the Revolutionary National Assembly, in 1920 he became a Member of the National Assembly. On its mandate, he resigned in 1922 after assuming the functions of a bishop. After the collapse of the Austro-Hungarian Empire and the creation of Czechoslovakia, the Nitra bishop was expelled from Czechoslovakia. Pope Benedict XV secretly appointed Karol Kmeťko the Bishop of Nitra on December 16, 1920. On May 11, 1944, Pope Pius XII appointed him Archbishop ad personam.
Eduard Nécsey
Dr. Eduard Nécsey was a Roman Catholic cleric, Titular Archbishop and Apostolic Administrator of the diocese of Nitra. Studied and ordained at Innsbruck In 1943 he was appointed Auxiliary Bishop of the Diocese of Nitra and was consecrated in Nitra on May 16, 1943. He defended his appointment to the communist regime and latter attended Vatican II; he died in Nitra in 1968.
Ján Pásztor
Ján Pásztor Educated in his native Prievidza. He studied theology in Nitra seminary and at the Charles University. Ordination in 1934 at Nitra parish and further studytill WW2. A doctorate in theology at Charles University Law at University of Bratislava. He became a priest in Dubnica in 1947 and In 1950 he was interned in a camp at Močenku and in 1953 imprisoned. After his release he worked as a parish administrator till 1961 and as till 1967. Pope Paul VI appointed him consultor of the Roman Commission for the revision of the Church's Code, and he later became the capitular vicar. In the 1960s he negotiated between the Czech government and the Vatican, and in 1973 he was appointed Bishop of Nitra.
Ján Chryzostom Korec
; born January 22, 1924; died October 24, 2015. He was ordained in 1950, and named a bishop in 1951. On 6 February 1990, he was appointed Bishop of Nitra ; retired 9 June 2005.
