Estádio Mário Duarte was a football stadium in Aveiro, Portugal.

[1] The name of the stadium comes from a Portuguese football player from Anadia, called Mário Duarte.

After the stadium's opening in 1935, it was decided that it would have his name, due to his social importance in the city of Aveiro.

The nickname "O Velhinho" ("The Old One", in English) refers not only to the age of the stadium, but to the fact that it was abandoned for 12 years.

Beira-Mar fans never quite accepted the club's moving to the more recent and larger Estádio Municipal de Aveiro, as both the club and the stadium have a deep emotional connection to the fans.