The fourth series of The Traitors was first broadcast on BBC One on 1 January 2026. Claudia Winkleman returned to present the series, which was accompanied by the spin-off show The Traitors: Uncloaked, presented by Ed Gamble. The series concluded on 23 January 2026 when Rachel Duffy and Stephen Libby won as Traitors, while Jack Butler placed as a runner-up as a Faithful.
In August 2024, prior to the beginning of the previous series, it was announced that The Traitors had been renewed for a fourth series. Applications for the series opened on 22 August 2024, before closing on 28 March 2025. Filming for the series began in June 2025. The first teaser for the fourth series aired at the end of the final of The Celebrity Traitors, which featured a figure wearing a Traitors' cloak carrying a lantern walking through a forest at night, whilst "Heart of Glass" played in the background. The series began on 1 January 2026.
The 22 contestants competing in the series were revealed at midnight on 1 January 2026, the day of the show's launch. Amongst the contestants were a mother and daughter, Judy and Roxy, and a couple, Ellie and Ross, none of whom revealed their relationships to the other players; Judy and Roxy's connection was revealed to the audience in the first episode, while Ellie and Ross's relationship was revealed to viewers only after Ross's banishment. Additionally, Netty and Ross were old acquaintances, who did not know each other would be present and were selected for the series independently; Netty exposed their connection to the other players upon their arrival.
In the first episode, Winkleman revealed that one contestant would be selected as a "Secret Traitor", whose identity would be hidden from both the audience and the regular Traitors. Each night, they would provide the Traitors with a shortlist of Faithful to murder. Contestants were therefore only initially identified as Faithful by appearing on murder shortlists selected by the Secret Traitor, or after being banished. In episode 4, the Secret Traitor was revealed to be Fiona after Traitors Stephen and Rachel completed a challenge to uncover her identity. Prior to this, the Secret Traitor was visually represented on screen as an unidentified figure dressed in a red cloak.
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Weekly ratings for each show on BBC One. All ratings are provided by BARB. The final episode of Uncloaked on BBC One achieved a rating of 8.06 million viewers.