Brasil

Existing & Under Construction
Belo Horizonte
Bertioga (Itatinga)
Brasilia
Campos do Jordao
Cariri
Curtiba
Fortaleza
Piraju
Pocos de Caldas
Porte Allegre
Recife
Rio de Janeiro
Salvador
Santos
Sao Paulo

Planned

Baixada Santista
Goiania
Maceio
Natal
Piracicaba
São Carlos
Sao Jose  dos Campos
Vitoria

Honorable Mention

Campinas(closed)
Macapa
Teresina


Goiania
light metro planned

A 15 km 18 station subway is planned and still awaiting approval from the World Bank since February 2003. Some are concerned that the bank will only loan Goiania the money if they already have it, which would mean, of course, that they didn't need it.

Newspaper article
Wikipedia page (PT)