Vox's victory could now pave the way for a far-right surge at a national level.
Spain's far-right Vox party could end up as kingmaker in the country's most populous region after winning 12 seats in an election in Andalusia.
It's the first time since the country's military dictatorship under Francisco Franco ended in 1975 that a far-right party has won seats in a Spanish regional election.
With the Socialists weakened in a region they governed since Franco's death and which they could now lose to a right-wing coalition, the Andalusia result could now pave the way for a far-right surge at a national level.
France's far-right leader Marine Le Pen tweeted (in French): "Strong and warm congratulations to my friends from Vox, who tonight in Spain scored a meaningful result for such a young and dynamic movement."
A series of local, municipal and European elections will follow at the end of May with politics in the euro zone's fourth-largest economy, long dominated by the Socialists and the conservative People's Party, upended by start-up parties.
"We are the ones who will bring about change, progress and the reconquest," Francisco Serrano, Vox's candidate in Andalusia told a loud crowd gathered in Seville, many of whom waved Spanish flags and chanted "Spain! Spain!"
Euronews Journalist, Carlos Rubio has more on the election result.