| Competition: | Campeonato Alagoano |
| Season: | 2020 |
| Winners: | CRB |
| Matches: | 34 |
| Total Goals: | 69 |
| Prevseason: | 2019 |
| Nextseason: | 2021 |
The 2020 Campeonato Alagoano (officially the Campeonato Alagoano Smile 2020 for sponsorship reasons)[1] was the 90th edition of the top football league in Alagoas. It began on 22 January 2020 and ended on 5 August 2020.
The final was played behind closed doors between CSA and CRB at the Estádio Rei Pelé in Maceió on 5 August 2020. CRB won the match 1–0, securing their 31st title.[2]
Originally, the team with the lowest number of points would be relegated to Campeonato Alagoano Sub 23–Série B 2021,[3] however due to the COVID-19 pandemic in Brazil, the relegation in the 2020 season was canceled by FAF.[4]
----CSA and CRB qualified for 2021 Copa do Brasil
2020 Campeonato Alagoano third place Murici and 2020 Copa Alagoas champions ASA played a two-legged play-off to determine the third team qualified for the 2021 Copa do Brasil. If tied on aggregate, the penalty shoot-out would be used to determine the winner.
----Murici qualified for 2021 Copa do Brasil