Portugal was represented by the song '"Silêncio e tanta gente", written and performed by Maria Guinot, at the 1984 Eurovision Song Contest, which took place on 5 May in Luxembourg City. The song was chosen through a national final organised by broadcaster RTP.

The Portuguese Final was held on 7 March 1984 at the Auditório Europa in Lisbon, hosted by Fialho Gouveia & Manuela Moura Guedes. The winner was chosen by an "expert" jury in two rounds of voting - the first to select the top 6 songs and the second to select the winner. Doce represented Portugal in ESC 1982. Two members of the group - Teresa Miguel & Fatima Padinha - also represented Portugal in ESC 1978 with the group Gemini. Paulo De Carvalho & Fernando Tordo were both with in the group 'Os Amigos' as represented Portugal in ESC 1977. Paulo also represented Portugal in 1974 & Fernando Tordo did the same in 1973.

Guinot was the nineteenth and last performer on the night of the contest, following Italy. At the close of voting, "Silêncio e tanta gente" had received 38 points, placing Portugal 11th of the 19. The Portuguese jury awarded its 12 points to Spain.

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