| Year: | 1985 |
| Country: | Portugal |
| Broadcaster: | Portuguese: [[Radiotelevisão Portuguesa]]|i=no (RTP) |
| Preselection: | Portuguese: [[Festival da Canção|Festival RTP da Canção]]|i=no 1985 |
| Preselection Date: | 7 March 1985 |
| Song: | Penso em ti, eu sei |
| Final Result: | 18th, 9 points |
Portugal was represented at the Eurovision Song Contest 1985 with the song "Portuguese: Penso em ti, eu sei|i=no", composed by Tozé Brito, with lyrics by Adelaide Ferreira and Luís Fernando, and performed by Ferreira herself. The Portuguese participating broadcaster, Portuguese: [[Radiotelevisão Portuguesa]]|i=no (RTP), selected its entry at the Portuguese: Festival RTP da Canção|i=no 1985.
Portuguese: [[Radiotelevisão Portuguesa]]|i=no (RTP) held the Portuguese: Festival RTP da Canção|i=no 1985 at the Coliseu dos Recreios in Lisbon on 7 March 1985, hosted by Margarida Andrade and Eládio Clímaco. Eleven songs competed at the national final. The votes of national juries chose the winner. The winning entry was "Portuguese: Penso em ti, eu sei|i=no", composed by Tozé Brito, with lyrics by Adelaide Ferreira and Luís Fernando, and performed by Ferreira herself.
| Draw | Artist | Song | Points | Place | |
|---|---|---|---|---|---|
| 1 | Eduarda | "Meu amor, minha dor, meu jardim" | 182 | 2nd | |
| 2 | Gustavo Sequeira | "Mágica" | 70 | 8th | |
| 3 | Jorge Silva | "Portugal, meu jardim" | 34 | 10th | |
| 4 | Alexandra | "Cantar saudade" | 130 | 6th | |
| 5 | Delfins | "A casa da praia" | 28 | 11th | |
| 6 | Nelo Silva | "Entre céu e mar" | 47 | 9th | |
| 7 | Luis Filipe | "Mulher só (mulher giesta)" | 133 | 5th | |
| 8 | Nuno and Henrique | "Meia de conversa" | 171 | 3rd | |
| 9 | Jorge Fernando | "Umbadá" | 168 | 4th | |
| 10 | "Penso em ti, eu sei" | 219 | 1st | ||
| 11 | Aguarela | "Malmequer, sim ou não" | 94 | 7th |
Adelaide Ferreira was the ninth performer on the night of the contest, following Belgium and preceding Germany. At Gothenburg, she was credited by only her first name. At the close of the voting the song had received 9 points, placing 18th in a field of 19 competing countries.[1] It was the worst ranking Portugal had received since 1981.