The Spanish participating broadcaster, Televisión Española (TVE), selected its entry through the third series of the reality television music competition Operación Triunfo.

Performing as the opening entry for the show in position 1, Spain placed tenth out of the 24 participating countries with 87 points.

It has also finished second four times, with "En un mundo nuevo" by Karina in 1971, "Eres tú" by Mocedades in 1973, "Su canción" by Betty Missiego in 1979, and "Vuelve conmigo" by Anabel Conde in 1995.

In 2002 and 2003, TVE used the reality television singing competition Operación Triunfo (the Spanish version of Star Academy) to select both the artist and song that would represent Spain.

The third series, also known as Operación Triunfo 2003, took place from 29 September 2003 to 21 December 2003 at the Mediapark Studios in Sant Just Desvern (Barcelona), hosted by Carlos Lozano.

The winner, "Para llenarme de ti" performed by Ramón, was selected exclusively through a public televote which ran between 21 and 28 February 2004.

[7] In addition to the performances of the competing entries, guest performers included former Operación Triunfo contestants Cristie Sánchez, Danni Úbeda, David Bustamante, Geno Machado, Gisela, Javián, Manuel Carrasco, Marey, Tessa Bodí and former Junior Eurovision contestant Sergio who represented Spain in 2003.