In this panoramic survey we tried to outline almost all of the existing differences which divide the Eastern form the Western Church. These differences are not numerous and can be grouped into those of inessential or liturgico-disciplinary nature, and those of essential, namely dogmatic character. The first group of the differences disputed are those that deal with the Old Testament Canon, i. e. numer of holy books officially recognized by the Church in question (the orthodox reject so-called Apocrypha), with different views on how many Oecumenical Councils there were, an vvith the doctrine on sacraments. In the seoond group, that of doctrinal differences, the author tries to draw our attention to the following disputed points: the doctrine on the procession of the Holy Ghost, on Roman Bishop’s Primacy, on Purgatory and on two Marian dogmas: the Immaculate Conception and the Assumption.