Spain took part in the Eurovision Song Contest 1970. The country was represented by Julio Iglesias with the song "Gwendolyne". The entry was selected through a national final organized by TVE .

The national final took place at the Palau Nacional in Barcelona from February 12 to 14, hosted by Laurita Valenzuela and Joaquín Prat. Prior to the final there had been a semi-final where artists like Nino Bravo had been eliminated. Ten songs went through the final. Each song was performed twice by different performers. 15 regional juries selected "Gwendolyne" as the winning song.

Julio Iglesias was the 9th to perform in the running order, following Luxembourg and preceding Monaco. He received 8 points for his performance, tying for the fourth place with France and Switzerland.

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