The 2021 Copa do Brasil third round was the third round of the 2021 Copa do Brasil football competition. It was played from 1 to 16 June 2021.[1] A total of 32 teams competed in the third round to decide 16 places in the final rounds of the 2021 Copa do Brasil.[2]
The draw for the third round was held on 23 April 2021, 14:00 at CBF headquarters in Rio de Janeiro.[3] In a first draw, the 32 teams, seeded by their CBF ranking, were drawn into 16 ties. The home and away teams of each leg were decided in a second draw. CBF ranking is shown in parentheses.
| width=21% | Pot A | width=21% | Pot B |
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In the third round, each tie was played on a home-and-away two-legged basis. If the aggregate score was level, the second-leg match would go straight to the penalty shoot-out to determine the winners.[2]
All times are Brasília time, BRT (UTC−3)|}
----Santos won 3–0 on aggregate and advanced to the round of 16.
----Bahia won 2–0 on aggregate and advanced to the round of 16.
----Tied 1–1 on aggregate, CRB won on penalties and advanced to the round of 16.
----São Paulo won 11–4 on aggregate and advanced to the round of 16.
----Fluminense won 3–2 on aggregate and advanced to the round of 16.
----Fortaleza won 4–1 on aggregate and advanced to the round of 16.
----Grêmio won 2–0 on aggregate and advanced to the round of 16.
----Tied 2–2 on aggregate, Criciúma won on penalties and advanced to the round of 16.
----Athletico Paranaense won 2–1 on aggregate and advanced to the round of 16.
----Atlético Mineiro won 4–1 on aggregate and advanced to the round of 16.
----Atlético Goianiense won 2–0 on aggregate and advanced to the round of 16.
----Vitória won 3–2 on aggregate and advanced to the round of 16.
----Tied 1–1 on aggregate, Juazeirense won on penalties and advanced to the round of 16.
----ABC won 4–3 on aggregate and advanced to the round of 16.
----Flamengo won 3–0 on aggregate and advanced to the round of 16.
----Vasco da Gama won 2–1 on aggregate and advanced to the round of 16.