Fernando Luiz Cumplido Mac Dowell da Costa[1] (July 7, 1945 – May 20, 2018) was a Brazilian engineer and politician.

He graduated with a degree in engineering from the University of the State of Rio de Janeiro (UERJ) in 1969, then becoming a professor there.

In the 1980s, he was director of the Carioca subway as the first line began running during the term of governor Chagas Freitas.

Mac Dowell died of a heart attack and complications resulting from an extensive acute myocardial infarction[2] on May 20, 2018 at age 72.

The mayor of Rio de Janeiro decreed an official mourning period of three days after his death.