ÖzetProtestanln ortaya çkna neden olan ve Reform’un yaplmasn hazrlayan olaylar, ayn zamandaKatolik Kilisesi’nin kendi içinden de baz eletirilerin seslendirilmesine zemin hazrlam-tr. 16.yy.’da balayan Hümanizm, Rönesans ve Reform hareketlerinin sonuçlarndan Katolik Kiliseside etkilenmitir. Bunun sonucunda Katolik Kilisesi kendi içinde baz konularn tartlmasnve Trento Konsili’ni (1545-1563) toplama karar almtr. Ancak, bu ‘otoriter ve tepkisel’ tedbirlerKilise’nin kendi mensuplarndan daha da uzaklamasna neden olmutur. Katolik Kilisesi tarihinde,Kilise’nin kendini ‘modern gelimelere ayak uydurmas’ ve hem doktrin hem de tekilatyaps bakmndan ‘güncellenmesini salamas’ anlamna gelen Aggiornamento yapma ihtiyacnhissettii ikinci önemli ‘reform’ çalmalar ise, üphesiz II. Vatikan Konsili ile olmutur. AratrmadaKatolik Kilisesi’ndeki bu deiimler ve Katoliklerin buna tepkisi ele alnmaktadr.Anahtar Kelimeler: II. Vatikan Konsili, Katolik Kilisesi, Modernizm, Aggiornamento, Konsiller.AbstractThe events that cause the emergence of Protestantism and prepare the execusion of the Reformationform a basis of some criticism within the Catholic Church at the same time. CatholicChurch also effected from Humanism which begin in the 16th century, Renaissance and Reform.As a result, Catholic Church decided to discuss some topics and to gather the council of theTrento (1545-1563). But the authoritative and reactional precautions resulted alienation of theChurch’s own members. In the Church history, II. Vatican council made the huge changing inthe field of the reconciliation of the church with the modernism which is called “Aggiornamento”.This study examines these changes of the Church and its reception by the catholics.Key Words: II. Vatican Council, Catholic Church, Modernism, Aggiornamento, Councils.