Sion Daniel Young (born in 1989) is a Welsh stage, television and film actor.
Siôn Daniel Young was born in Cardiff, Wales.
He trained as an actor at the Royal Scottish Academy of Music & Drama, now known as the Royal Conservatoire of Scotland.
Young's first professional role was appearing in Daf James play Llwyth (Tribe), which was the first play about gay characters written by a queer person on a Welsh-language stage. He played the role of Albert Narracott in War Horse at the Royal National Theatre, London in 2013.
In 2015, he had the lead role of Christopher Boone in the stage play adaptation of The Curious Incident of the Dog in the Night-Time at the Gielgud Theatre in London.
In 2017, he played Davey in Gary OwenâÂÂs Olivier award winning play âÂÂKillologyâ at The Royal Court Theatre.
In 2018, he appeared in the world premiere production of Barney NorrisâÂÂs play Nightfall at the Bridge Theatre, London, alongside Claire Skinner and Ophelia Lovibond.
In 2019, Sion performed in âÂÂJellyfishâ in the Dorfman theatre at the National Theatre.
He then returned to the Royal Court theatre in London to perform in Ed Thomasâ âÂÂOn Bear Ridgeâ alongside Rhys Ifans.
Young appeared in the 2012 war film Private Peaceful. In 2014, he appeared in World War One-centenary series Our World War
He had the lead role in 2019 television drama film The Left Behind. For the role he was nominated for Best Actor at the 2020 BAFTA Cymru Awards. The film won BAFTA and Royal Television Society awards for Best Single Drama.
In 2021, he played Colin Stagg in Channel 4 miniseries Deceit. A true story based on a man wrongly accused of murder in 1992, described as one of the gravest miscarriages of justice in British legal history. . Sion was nominated for Best Actor at the 2022 BAFTA Cymru awards for his performance.
In series three of Apple TV+ espionage thriller Slow Horses, he played Douglas, an MI5 records keeper. For this, Sion received his third Best Actor BAFTA Cymru nomination.
He also appeared in Channel 5 crime thriller Witness Number 3.
In 2024, Sion played the lead role of Gabriel in BBC One drama Lost Boys and Fairies. Written by Daf James, it was BBC OneâÂÂs first primetime gay adoption drama. For his role in the series he won Best Actor at the BAFTA Cymru Awards in 2025. That year, he could be seen in Cardiff-set BBC One series The Guest alongside Gabrielle Creevy.
He is a first-language Welsh speaker.