Portugal was represented at the Eurovision Song Contest 1965 with the song "Sol de inverno", composed by Carlos Nóbrega e Sousa, with lyrics by Jerónimo Bragança, and performed by Simone de Oliveira.

Radiotelevisão Portuguesa (RTP) held the Grande Prémio TV da Canção Portuguesa 1965 on 6 February 1965 at 21:55 UTC in its Lumiar studios in Lisbon, hosted by Henrique Mendes.

[2] On the night of the final Oliveira performed 12th in the running order, following France and preceding Italy.

Each national jury awarded 5-3-1 to their top three songs, and at the close "Sol de inverno" had picked up only 1 point (from Monaco), placing Portugal joint 13th (with Norway) of the 18 entries.

[3] The orchestra during the Portuguese entry was conducted by Fernando de Carvalho.