Yes.
It has always been a teaching of the Catholic Church, from the time of the Apostles who recieved that teaching from Our Lord, that there is One Church, Holy Roman Catholic and Apostolic and outside of her there is to be found no salvation.
Extra Ecclesiam nulla salus
Fourth Lateran Council (1215): “There is but one universal Church of the faithful, outside which no one at all is saved.”
**Pope Boniface VIII, Bull Unam Sanctam (1302): **“We declare, say, define, and pronounce that it is absolutely necessary for the salvation of every human creature to be subject to the Roman Pontiff.”
**Pope Eugene IV, Bull Cantate Domino (1441): **“The most Holy Roman Church firmly believes, professes and preaches that none of those existing outside the Catholic Church, not only pagans, but also Jews and heretics and schismatics, can have a share in life eternal; but that they will go into the eternal fire which was prepared for the devil and his angels, unless before death they are joined with Her; and that so important is the unity of this ecclesiastical body that only those remaining within this unity can profit by the sacraments of the Church unto salvation, and they alone can receive an eternal recompense for their fasts, their almsgivings, their other works of Christian piety and the duties of a Christian soldier. No one, let his almsgiving be as great as it may, no one, even if he pour out his blood for the Name of Christ, can be saved, unless he remain within the bosom and the unity of the Catholic Church.”
Pope Pelagius II (578-590): “Consider the fact that whoever has not been in the peace and unity of the Church cannot have the Lord. …Although given over to flames and fires, they burn, or, thrown to wild beasts, they lay down their lives, there will not be (for them) that crown of faith but the punishment of faithlessness. …Such a one can be slain, he cannot be crowned. …[If] slain outside the Church, he cannot attain the rewards of the Church”.
Saint Gregory the Great (590-604), Moralia: “Now the holy Church universal proclaims that God cannot be truly worshipped saving within herself, asserting that all they that are without her shall never be saved.”
**Pope Innocent III (1198-1216): **“With our hearts we believe and with our lips we confess but one Church, not that of the heretics, but the Holy Roman Catholic and Apostolic Church, outside which we believe that no one is saved” .
Pope Leo XII (1823-1829), Encyclical Ubi Primum: “We profess that there is no salvation outside the Church. … For the Church is the pillar and ground of the truth. With reference to those words Augustine says: `If any man be outside the Church he will be excluded from the number of sons, and will not have God for Father since he has not the Church for mother.’”
Pope Gregory XVI (1831-1846), Encyclical Summo Jugiter: “It is not possible to worship God truly except in Her; all who are outside Her will not be saved.”
Pope Pius IX (1846-1878), Encyclical Quanto conficiamur moerore, 8: “Well known is the Catholic teaching that no one can be saved outside the Catholic Church. Eternal salvation cannot be obtained by those who oppose the authority and statements of the same Church and are stubbornly separated from the unity of the Church and also from the successor of Peter, the Roman Pontiff”; also: Talk Singulari quadam: “It must be held by faith that outside the Apostolic Roman Church, no one can be saved; that this is the only ark of salvation; that he who shall not have entered therein will perish in the flood”
Pope Leo XIII (1878-1903), Encyclical Annum Ingressi Sumus: “This is our last lesson to you; receive it, engrave it in your minds, all of you: by God’s commandment salvation is to be found nowhere but in the Church.”
idem, Encyclical Sapientiae Christianae:“He scatters and gathers not who gathers not with the Church and with Jesus Christ, and all who fight not jointly with Him and with the Church are in very truth contending against God.”
Pope Pius X (1903-1914), Encyclical Jucunda Sane: “It is our duty to recall to everyone great and small, as the Holy Pontiff Gregory did in ages past, the absolute necessity which is ours, to have recourse to this Church to effect our eternal salvation.”
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