David Hierro

Hierro was born in Palencia in Castile and León and has two children as of 2025.^[2] He graduated with a history degree from the University of Valladolid, specialising in prehistory, archaeology, ancient and medieval history. He has contributed to archaeological investigations by his alma mater, as well as working as a business consultant.^[2]

Hierro joined Vox in February 2014.^[2] In the 2022 Castilian-Leonese regional election, he was the only Vox member among seven deputies elected to the Cortes of Castile and León by the Palencia constituency; he had been a consultant for the party group in the previous parliamentary term.^[3] On 3 February 2025, when Juan García-Gallardo quit frontline politics, Hierro succeeded him as Vox's leader in Castile and León.^[4] In the 2026 Castilian-Leonese regional election, President of the Cortes Carlos Pollán led Vox's entire campaign, while Hierro led their list in Palencia; he retained his seat while the People's Party (PP) and Spanish Socialist Workers' Party (PSOE) shared the remaining six.^[5]

In 2025, El Español reported that Vox members in Castile and León considered Hierro to be aligned with the party's central leadership under Santiago Abascal.^[2] Upon taking control of the party in the region, Hierro rejected his predecessor García-Gallardo's allegation of Vox being run as an oligarchy. Hierro disagreed with being called the regional leader of Vox, saying that the leader in all regions was Abascal.^[6]

Hierro is an opponent of organised labour, and has alleged that union leaders have control over the PP.^[2] He opposes the 2030 Agenda, and tore up a document relating to it in the Cortes, subsequently uploading the photo of the incident as his profile picture on Twitter.^[2]