| Club: | River Plate |
| Season: | 2018–19 |
| Chrtitle: | President |
| Chairman: | Rodolfo D'Onfrio |
| Mgrtitle: | Coach |
| Manager: | Marcelo Gallardo |
| Stadium: | Estadio Monumental Antonio Vespucio Liberti |
| League: | Primera División |
| League Result: | 4th |
| Prevseason: | 2017–18 |
| Nextseason: | 2019–20 |
| Cup1: | Copa Argentina |
| Cup1 Result: | Semi-finals |
| Cup2: | Copa Libertadores |
| Cup2 Result: | Winners |
| Cup3: | FIFA Club World Cup |
| Cup3 Result: | Third place |
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The 2018–19 season was Club Atlético River Plate's 8th consecutive season in the top-flight of Argentine football. The season covers the period from 1 July 2018 to 30 June 2019.
| Number | Pos. | Name | To | |
|---|---|---|---|---|
| 3 | DF | Marcelo Saracchi | RB Leipzig | |
| 16 | MF |  Ariel Rojas | San Lorenzo de Almagro | |
| MF | Nicolas Bertolo | Club Atletico Banfield | ||
| FW | Juan Cruz Kaprof | Atletico Tucuman |
| Number | Pos. | Name | From | |
|---|---|---|---|---|
| 2 | DF | Robert Rojas | Club Guarani | |
| 4 | DF | Fabrizio Angileri | Godoy Cruz | |
| 7 | FW | Matias Suarez | Club Atletico Belgrano | |
| 8 | MF |  Jorge Carrascal |  FC Karpaty Lviv |
| Number | Pos. | Name | From | |
|---|---|---|---|---|
| 2 | DF | Jonatan Maidana |  Club Deportivo Toluca | |
| 7 | FW | Rodrigo Mora | Retired | |
| 10 | MF | Pity Martinez |  Atlanta United |
| Number | Pos. | Name | To | |
|---|---|---|---|---|
| 4 | DF | Jorge Moreira | Portland Timbers | |
| 9 | FW | Marcelo Larrondo | Union La Calera | |
| 17 | MF | Carlos Auzqui | Club Atletico Huracan | |
| 21 | MF | Iván Rossi | Club Atletico Banfield |
See main article: 2018–19 Argentine Primera División.