The concert is to take place on 7 June at the Altice Arena in Lisbon’s Park of Nations. Tickets go on sale this Friday, 23 February.
Queen and Adam Lambert last performed in Portugal at the Rock in Rio event in 2016.
Alongside a successful solo career, Lambert, who rose to fame in 2009 after finishing as runner-up on the eighth season of American Idol, has collaborated with rock band Queen as lead vocalist for Queen + Adam Lambert since 2011, culminating in a successful worldwide tour from 2014 to 2017.