Márcio Miguel Bittar (born 28 June 1963) is a Brazilian politician.

Although born in São Paulo, he has spent his political career representing Acre, serving as federal senator since 2019.

[4] In his youth he was part of several militant leftist communist and socialists groups, but in his university years he joined the center-right PMDB.

[3] From 1997 to 2003 he was the vice-leader of the Popular Socialist Party in the federal legislature.

In the second round of the 2014 election though he narrowly lost by around 10,000 votes to eventual winner Tião Viana.

[6] In 2017 after having disagreements with his then political party the PSDB, Bittar rejoined the PMDB.

[8] Despite his early left-wing involvement, today politically Bittar is considered strongly economically liberal and socially conservative.

[9] Highly critical of the Workers' Party's handling of the economy, Bittar was a vocal supporter of limiting government spending and the 2017 Brazil labor reform.