| Waldir Maranhão | |
| Office: | Federal Deputy for Maranhão |
| Term Start: | 1 February 2007 |
| Term End: | 1 February 2019 |
| Office2: | First Vice President of the Chamber of Deputies |
| Term Start2: | 1 February 2015 |
| Term End2: | 2 February 2017 |
| Predecessor2: | Arlindo Chinaglia |
| Successor2: | Fábio Ramalho |
| Office3: | President of the Chamber of Deputies |
| Term Start3: | 5 May 2016 |
| Term End3: | 14 July 2016 |
| Predecessor3: | Eduardo Cunha |
| Successor3: | Rodrigo Maia |
| Birth Date: | 4 August 1955 |
| Birth Place: | São Luís, Maranhão |
| Party: | PSDB |
| Profession: | Veterinary Surgeon |
Waldir Maranhão Cardoso (born 4 August 1955) is a Brazilian politician and a member of the Brazilian Social Democracy Party (PSDB). He was rector of the State University of Maranhão (Universidade Estadual do Maranhão) before being elected to the Chamber of Deputies in 2006. As Vice President of the Chamber (since 2007) he became Acting President of the Chamber of Deputies on 5 May 2016 following the suspension of Eduardo Cunha,[1] [2] [3] [4] until new elections were held on July 13, with Rodrigo Maia as the new president.