| Date | Age | Event | Bishop | Title | Current Title |
|---|
| 17 Apr 2018 | 77.4 | Retired | José María Arancedo | Archbishop of Santa Fe de la Vera Cruz | Archbishop Emeritus |
| 58.9 | Appointed | Sergio Alfredo Fenoy | Archbishop of Santa Fe de la Vera Cruz |
| 24 Apr 2018 | 55.7 | Ceased | Victor Manuel Fernández | Rector | Archbishop of La Plata |
| 28 Apr 2018 | 56.5 | Ordained Bishop | Florencio Félix Paredes Cruz, C.R.L. | Coadjutor Prelate of Humahuaca |
| 18 May 2018 | 67.0 | Ordained Bishop | Luis Antonio Scozzina, O.F.M. | Bishop of Orán |
| 68.4 | Ceased | Andrés Stanovnik, O.F.M. Cap. | Apostolic Administrator of Orán | Archbishop of Corrientes |
| 19 May 2018 | 74.5 | Appointed | Leonardo Sandri | Cardinal-Priest of Santi Biagio e Carlo ai Catinari | Cardinal, Prefect of the Congregation for the Oriental Churches |
| 22 May 2018 | 49.8 | Ceased | Dante Gustavo Braida Lorenzón | Apostolic Administrator of Mendoza | Bishop of La Rioja |
| 57.1 | Appointed | Marcelo Daniel Colombo | Archbishop of Mendoza |
| 2 Jun 2018 | 75.0 | Retired | Héctor Rubén Aguer | Archbishop of La Plata | Archbishop Emeritus |
| 55.8 | Appointed | Victor Manuel Fernández | Archbishop of La Plata |
| 4 Jun 2018 | 62.8 | Appointed | Alberto Germán Bochatey Chaneton, O.S.A. | Apostolic Administrator of La Plata | Auxiliary Bishop |
| 9 Jun 2018 | 59.0 | Installed | Sergio Alfredo Fenoy | Archbishop of Santa Fe de la Vera Cruz |
| 15 Jun 2018 | 59.2 | Appointed | Miguel Ángel D’Annibale | Bishop of San Martín |
| 75.0 | Retired | Guillermo Rodríguez-Melgarejo | Bishop of San Martín | Bishop Emeritus |
| 16 Jun 2018 | 62.8 | Ceased | Alberto Germán Bochatey Chaneton, O.S.A. | Apostolic Administrator of La Plata | Auxiliary Bishop |
| 55.9 | Installed | Victor Manuel Fernández | Archbishop of La Plata |
| 28 Jun 2018 | 74.6 | Appointed | Leonardo Sandri | Cardinal-Bishop of Santi Biagio e Carlo ai Catinari | Cardinal, Prefect of the Congregation for the Oriental Churches |
| 4 Jul 2018 | 78.3 | Retired | Vartán Waldir Boghossian, S.D.B. | Apostolic Exarch of America Latina e Messico {Latin America and Mexico} (Armenian) | Bishop Emeritus of San Gregorio de Narek en Buenos Aires (Armenian) |
| 78.3 | Retired | Vartán Waldir Boghossian, S.D.B. | Bishop of San Gregorio de Narek en Buenos Aires (Armenian) | Bishop Emeritus |
| 64.6 | Appointed | Pablo León Hakimian | Bishop of San Gregorio de Narek en Buenos Aires (Armenian) |
| 64.6 | Appointed | Pablo León Hakimian | Apostolic Exarch of America Latina e Messico {Latin America and Mexico} (Armenian) | Bishop of San Gregorio de Narek en Buenos Aires (Armenian) |
| 24 Jul 2018 | 65.2 | Appointed | Fernando Miguel Gil Eisner | Bishop of Salto, Uruguay |
| 11 Aug 2018 | 57.3 | Installed | Marcelo Daniel Colombo | Archbishop of Mendoza |
| 23 Sep 2018 | 65.3 | Ordained Bishop | Fernando Miguel Gil Eisner | Bishop of Salto, Uruguay |
| 27 Sep 2018 | 62.5 | Appointed | Luis Mariano Montemayor | Apostolic Nuncio to Colombia |
| 29 Sep 2018 | 64.8 | Ordained Bishop | Pablo León Hakimian | Bishop of San Gregorio de Narek en Buenos Aires (Armenian) |
| 2 Oct 2018 | 86.3 | Died | José Lorenzo Sartori † | Bishop Emeritus of San Roque de Presidencia Roque Sáenz Peña |
| 26 Oct 2018 | 56.4 | Appointed | Guillermo Eduardo Caride | Auxiliary Bishop of San Isidro |
| 56.4 | Appointed | Guillermo Eduardo Caride | Titular Bishop of Iomnium | Auxiliary Bishop of San Isidro |
| 7 Nov 2018 | 57.1 | Appointed | Damián Gustavo Nannini | Bishop of San Miguel |
| 7 Dec 2018 | 56.5 | Ordained Bishop | Guillermo Eduardo Caride | Titular Bishop of Iomnium | Auxiliary Bishop of San Isidro |
| 13 Dec 2018 | 50.4 | Appointed | Dante Gustavo Braida Lorenzón | Bishop of La Rioja |
| 14 Dec 2018 | 57.2 | Ordained Bishop | Damián Gustavo Nannini | Bishop of San Miguel |
| 28 Dec 2018 | 50.4 | Installed | Dante Gustavo Braida Lorenzón | Bishop of La Rioja |
| 3 Jan 2019 | 50.7 | Appointed | Jorge Ignacio García Cuerva | Bishop of Río Gallegos |
| 20 Mar 2019 | 58.0 | Appointed | Luis Dario Martín | Auxiliary Bishop of Santa Rosa | Auxiliary Bishop-Elect |
| 58.0 | Appointed | Luis Dario Martín | Titular Bishop of Bisenzio | Auxiliary Bishop-Elect of Santa Rosa |
| 27 Apr 2019 | 95.7 | Beatified | Enrique Ángel Angelelli Carletti † | Bishop of La Rioja |
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