The 2015 Copa do Brasil Third Round will be played from 20 May to 22 July 2015 to decide the 10 teams advancing to the knockout rounds. Different than the first two rounds, in this round the away team that wins the first match by 2 or more goals do not progress straight to the next round avoiding the second leg. The order of the matches was determined by a random draw. This phase had a pause during the 2015 Copa América.
Palmeiras won 1–0 on aggregate.
Figueirense won 3–2 on aggregate.
Santos won 4-3 on aggregate.
Flamengo won 3-1 on aggregate.
Tied 3–3 on aggregate, Ituano won on away goals.
Tied 3-3 on aggregate, Coritiba won on penalties.
Vasco won 6-3 on aggregate.
Ceará won 2-1 on aggregate.
Tied 1-1 on aggregate, Grêmio won on penalties.
Paysandu won 3-2 on aggregate.