Garrafeira is an intermediate vintage dated style of Port made from the grapes of a single harvest that combines both the oxidative maturation of years in wood, with further reductive maturation in large glass demijohns. It is required by the IVDP that wines spend some time in wood, usually between three and six years, followed by at least a further eight years in glass, before bottling. In practice the times spent in glass are much longer. At present, only one company, Niepoort, markets Garrafeiras. Their black demijohns, affectionately known as bon-bons, hold approximately 11 litres each.

Confusingly, the word Garrafeira may be found on some very old Tawny labels, where the contents of the bottle are of exceptional age.