| Chairman: | (until 8 February) Juan David Pérez (since 12 February) |
| Manager: | Jorge Almirón (until 30 August) (since 30 August to 1 November) Paulo Autuori (since 2 November) |
| League Result: | Apertura: Runners-up Finalización: 9th |
| Cup1 Result: | Champions |
| League Topscorer: | Dayro Moreno (19 goals) |
| Season Topscorer: | Dayro Moreno (24 goals) |
| Highest Attendance: | 42,560 (v. Millonarios) |
| Lowest Attendance: | 7,986 (v. Leones) |
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| Prevseason: | 2017 |
| Nextseason: | 2019 |
The 2018 Atlético Nacional season was the 71st season in the club's history. The team competed in the Categoría Primera A, Copa Colombia, Superliga Colombiana, and Copa Libertadores.
Source: Soccerway
| Name | Age | Moving from | Type | Date | ||
|---|---|---|---|---|---|---|
| GK}}|GK |  Cristian Bonilla | La Equidad | Loan return | 30 June 2018 | ||
| DF}}|DF | Omar Duarte | Atlético Huila | Transfer | 30 June 2018 | ||
| DF}}|DF | Tomás Maya | Deportivo Pasto | Loan return | 30 June 2018 | ||
| MF}}|MF | Juan Pablo Ramírez | Leones | Loan return | 30 June 2018 | ||
| FW}}|FW | Carlos Rivas |  New York Red Bulls | Loan | 30 June 2018 | ||
| DF}}|DF | Deiver Machado |  Gent | Transfer | 30 June 2018 | ||
| MF}}|MF | Yerson Candelo |  Querétaro | Transfer | 19 June 2018 | ||
| DF}}|DF | Jeisson Palacios | Atlético Bucaramanga | Loan return | 19 June 2018 | ||
| FW}}|FW |  Ezequiel Rescaldani |  Huesca | Loan return | 28 May 2018 | ||
| FW}}|FW | Reinaldo Lenis |  Sport Recife | Loan | 5 February 2018 | ||
| DF}}|DF | Rafael Delgado | Defensa y Justicia | Loan | 3 February 2018 | ||
| DF}}|DF | Camilo Zúñiga |  Napoli | Loan | 30 January 2018 | ||
| MF}}|MF | Gonzalo Castellani | Boca Juniors | Transfer | 25 January 2018 | ||
| MF}}|MF | Sherman Cárdenas |  LDU Quito | Loan return | 24 January 2018 | ||
| GK}}|GK | Fernando Monetti | Lanús | Transfer | 16 January 2018 | ||
| DF}}|DF | Diego Braghieri | Lanús | Transfer | 16 January 2018 | ||
| DF}}|DF | Helibelton Palacios | Club Brugge | Transfer | 31 December 2017 | ||
| MF}}|MF | Vladimir Hernández | Santos | Transfer | 31 December 2017 | ||
| FW}}|FW | Cristián Dajome | Deportivo Pasto | Loan return | 31 December 2017 | ||
| MF}}|MF | Jorman Campuzano | Deportivo Pereira | Loan | 31 December 2017 | ||
| FW}}|FW | Juan David Castañeda | Fortaleza | Loan return | 31 December 2017 | ||
| DF}}|DF | Tomás Maya | Leones | Loan return | 31 December 2017 | ||
| MF}}|MF | Juan Pablo Ramírez | Deportivo Pasto | Loan return | 31 December 2017 |
| Name | Age | Moving to | Type | Date | ||
|---|---|---|---|---|---|---|
| FW}}|FW | Dayro Moreno | Club Tijuana | Fired | 16 October 2018 | ||
| DF}}|DF | Rafael Delgado | Defensa y Justicia | Loan return | 31 July 2018 | ||
| GK}}|GK | Cristian Bonilla | Al-Fayha | Transfer | 30 June 2018 | ||
| DF}}|DF |  Roderick Miller | Free agent | Transfer | 30 June 2018 | ||
| MF}}|MF | Juan Pablo Nieto | Once Caldas | Transfer | 30 June 2018 | ||
| MF}}|MF | Macnelly Torres | Deportivo Cali | Transfer | 30 June 2018 | ||
| DF}}|DF | Tomás Maya | Atlético Huila | Loan | 30 June 2018 | ||
| FW}}|FW | Andrés Rentería | Querétaro | Loan return | 24 June 2018 | ||
| FW}}|FW | Hadier Borja | América de Cali | Loan | 19 June 2018 | ||
| DF}}|DF | Jeisson Palacios | Cortuluá | Loan | 19 June 2018 | ||
| MF}}|MF |  Ronaldo Lucena | Deportivo Táchira | Transfer | 12 June 2018 | ||
| DF}}|DF | Edwin Velasco | Once Caldas | Transfer | 12 June 2018 | ||
| MF}}|MF | Diego Arias | Once Caldas | Transfer | 12 June 2018 | ||
| DF}}|DF | Jackson Montaño | Deportes Quindío | Loan return | 31 May 2018 | ||
| FW}}|FW | Ezequiel Rescaldani | Patronato | Transfer | 28 May 2018 | ||
| DF}}|DF | José Pérez | Cúcuta Deportivo | Transfer | 21 March 2018 | ||
| FW}}|FW | Jeferson Rivas | Tigres | Loan | 15 March 2018 | ||
| MF}}|MF | Jean Rivera | Real Santander | Loan | 22 February 2018 | ||
| MF}}|MF | Edwin Valencia | Free agent | Transfer | 1 February 2018 | ||
| MF}}|MF | Sherman Cárdenas | Atlético Bucaramanga | Loan | 24 January 2018 | ||
| DF}}|DF | Gorka Elustondo | Rayo Vallecano | Transfer | 16 January 2018 | ||
| GK}}|GK | Franco Armani | River Plate | Transfer | 8 January 2018 | ||
| FW}}|FW | Cristián Dajome | América de Cali | Loan | 2 January 2018 | ||
| FW}}|FW | Juan David Castañeda | Real Santander | Loan | 31 December 2017 | ||
| DF}}|DF | Nicolás Hernández | Real Santander | Loan | 31 December 2017 | ||
| MF}}|MF | Cristian Moya | Real Santander | Loan | 31 December 2017 | ||
| DF}}|DF | Albin Domínguez | Real Santander | Loan | 31 December 2017 | ||
| DF}}|DF | Franky Uribe | Real Santander | Loan | 31 December 2017 | ||
| DF}}|DF | Tomás Maya | Deportivo Pasto | Loan | 31 December 2017 | ||
| DF}}|DF | Rodin Quiñónes | Independiente Medellín | Transfer | 31 December 2017 | ||
| DF}}|DF | Ezequiel Palomeque | Deportivo Cali | Transfer | 31 December 2017 | ||
| GK}}|GK | Camilo Vargas | Deportivo Cali | Loan | 31 December 2017 | ||
| MF}}|MF | Jhon Mosquera | Deportivo Cali | Transfer | 31 December 2017 | ||
| FW}}|FW | Luis Carlos Ruiz | Junior | Transfer | 31 December 2017 | ||
| MF}}|MF | Juan Pablo Ramírez | Leones | Loan | 31 December 2017 |
| Match won | Match drawn | Match lost |
See main article: article and 2018 Categoría Primera A season.
Note: For a complete table see the main article
| Match won | Match drawn | Match lost |
†: Match postponed due to participation in the Copa Libertadores.
‡: Match postponed due to Deportivo Cali's participation in the Copa Sudamericana.
Note: For a complete table see the main article
| Match won | Match drawn | Match lost |
See main article: article and 2018 Copa Libertadores.
| Match won | Match drawn | Match lost |
See main article: article and 2018 Copa Libertadores final stages.
See main article: article and 2018 Copa Colombia.
See main article: article and 2018 Superliga Colombiana.
Source: Soccerway