Margareth Buzetti (born 31 October 1959) is a Brazilian businesswoman and politician. She has been a senator from the state of Mato Grosso since 2023 as part of the Social Democratic Party (PSD). She is a substitute for Carlos Fávaro, who resigned in order to become the Minister of Agriculture.
Buzetti was born in Concórdia, Santa Catarina. She had served as a senator as Fávaro had previously resigned temporarily for 120 days due to medical leave. Formerly a member of the Progressistas (PP), she left the party in 2022 as Fávaro became a member of president Luiz Inácio Lula da Silva's cabinet. She again became a senator afterwards.