The Unthanks (until 2009 called Rachel Unthank and the Winterset) are an English folk group known for their eclectic approach in combining traditional English folk, particularly Northumbrian folk music, with other musical genres. Their debut album, Cruel Sister, was Mojo magazine's Folk Album of the Year in 2005. Of their 11 subsequent albums, ten have received four or five-starred reviews in the British national press. Their album Mount the Air, released in 2015, won in the best album category in the 2016 BBC Radio 2 Folk Awards. In 2017 they released two albums featuring the songs and poems of Molly Drake, mother of singer-songwriter and musician Nick Drake.

Lines (Parts One, Two & Three), a trilogy of albums about the Hull triple trawler tragedy (1968), the First World War and the poems of Emily Brontë – the principal link between them being their focusing on female perspectives across time – was released in 2019. Their album, Live and Unaccompanied, was released in 2020. Their album Sorrows Away was released in 2022 and received four-starred reviews in The Observer and The Scotsman and a five-starred review in the Financial Times. Their 2024 double album, In Winter, received a four-starred review in the Financial Times and a five-starred review in The Times.

Originally an all-female band, Rachel Unthank and the Winterset made their debut performance at Holmfirth Folk Festival on 7 May 2004 and launched their debut album Cruel Sister at the same festival venue the following year, on 11 May 2005. Cruel Sister received support from a number of DJs on BBC Radio 2 and was subsequently awarded Folk Album of the Year by Mojo magazine.

Their follow-up album, The Bairns, released on 20 August 2007, was nominated for the Best Album award at the BBC Radio 2 Folk Awards 2008 and was runner-up for the 2008 Mercury Prize. The album debuted in the UK Top 200 Albums Chart at number 178 in the week after the Mercury Prize award ceremony. Reviewing The Bairns for BBC Music, Mel Ledgard described it as "an album with a cinematic quality, huge in dramatic atmosphere". In a four-starred review, Robin Denselow of The Guardian nominated it as "one of the folk records of the year".

The band were nominated for three further BBC Radio 2 Folk Awards in 2008 (Best Band, Best Live Act, Horizon Award), and were successful in one category, receiving the Horizon Award at the ceremony in The Brewery, London.

In 2009, the band became the Unthanks, and their manager Adrian McNally and his childhood friend Chris Price joined the group. Here's the Tender Coming, their third album (and the first under the Unthanks moniker), was released on 14 September 2009. It was Folk Album of the Year for The Guardian and also for Mojo magazine. Sid Smith, of BBC Music, described it as an "astonishing record", "beautiful", "haunting", and "beguiling". In a four-starred review for The Guardian, Colin Irwin said: "This album may not be quite as bleak as The Bairns, and the sound is more sophisticated, but they still sound like nobody else... Tracks build slowly and mysteriously, but all are in service of the song. Their arrangement of the title track − a traditional song about the emotional devastation wrought by press gangs − brilliantly encapsulates the story's fraught desperation. Their version of Nobody Knew She Was There, one of Ewan MacColl's lesser-known songs about his mother, painstakingly paints a similarly dramatic backdrop with more atmospheric brass, and they put their own stamp on the Nic Jones classic, Annachie Gordon."

Their fourth album, Last, was released on 14 March 2011, reaching number 40 in the UK albums chart, and received a five-starred review in the Sunday Express and four-starred reviews in The Guardian and The Daily Telegraph. In his review for the Sunday Express, Martin Townsend proclaimed it "a gorgeously unhurried, utterly mesmerising masterpiece". Thomas H Green of The Daily Telegraph said it was "string-laden and luscious but also delicate, wistful and melancholy". Robin Denselow, for The Guardian, described it as "a bold and highly original set". Sid Smith, for BBC Music, said that "Proving once again that sad songs are very often the best, their fourth album is brimming with material that is as haunting as it is beautiful."

Writing in NME, Anthony Thornton said that the album "proves the mix of Rachel and Becky's voices to be one of the true wonders of 21st-century music". As well as traditional material, the album included a song written by band member McNally ("Last"), and versions of songs by Jon Redfern ("Give Away Your Heart"), Tom Waits and Kathleen Brennan ("No One Knows I'm Gone"), King Crimson ("Starless") and Alex Glasgow ("Close the Coalhouse Door").