Operación Triunfo is a Spanish reality television music competition to find new singing talent. The ninth series, also known as Operación Triunfo 2017, aired on La 1 from 23 October 2017 to 5 February 2018, presented by Roberto Leal. It was the first season broadcast by RTVE, which aired the first three seasons, in thirteen years. Seasons 4–8 of Operación Triunfo aired on Telecinco, which discontinued the series in 2011 due to declining ratings. RTVE approved to revive the series with a budget of 10.2 million euros.

In addition to the Galas or weekly live shows on La 1, daily recap shows aired on Clan, and the side show El Chat aired on La 1 after each weekly Gala, hosted by Noemí Galera. The activities of the contestants at "The Academy" or La Academia were streamed live via YouTube and the subscription platform Sky España.

Amaia Romero was announced the winner on 5 February 2018. Aitana Ocaña came second.

On 4 December 2017, during sixth week's live show or "Gala 6", it was announced that the series would serve as the platform to select the Spanish entrant at the Eurovision Song Contest 2018.[6] On 20 December 2017, TVE announced that the five contestants that would succeed in advancing to the series' final would also be the five candidates to represent Spain at Eurovision. The live show that selected the Spanish entrant and song for Eurovision took place on 29 January 2018. Alfred García and Amaia Romero were selected with the song "Tu canción".

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