The 'Anywhere' hitmaker and indie rockers have both been announced as part of a star-studded lineup for Clara Amfo's weekday programme.
From Thursday November 1 through to Thursday November 29, a host of big names will step into the studio to perform an original song and a cover of their choice.
As well as Rita and The 1975 on November 19 and November 26 respectively, audiences will also be treated to sets from the likes of Dizzee Rascal, Twenty One Pilots, Blossoms, Goerge Ezra and Jess Glynne.
Meanwhile, there will also be a special performance from Mumford And Sons and Live Lounge Symphony to bring the exciting bill to a close, with the 'Little Lion Man' band excited to be back in the studio.
They said: ''We're so stoked to be playing the Live Lounge for the fourth time - it remains one of the Great British institutions.''
Chris Price, Head of Music, Radio 1 and 1Xtra, added: ''There's nothing like Radio 1's Live Lounge for getting closer to your favourite artist - or discovering a new one.
''Starting with an intimate, hometown portrait of Twenty One Pilots in the venue where it all started for them, and culminating with a symphonic interpretation of Mumford & Sons' best known and newest songs, 'Live Lounge Month 2018' will once again bring you established and emerging artists as you've never seen them before.''
Full 'Live Lounge' lineup:
Thursday 1st November: Twenty One Pilots
Monday 5th November: Dizzee Rascal
Tuesday 6th November: Marshmello and Bastille
Wednesday 7th November: Robyn
Thursday 8th November: Hozier
Monday 12th November: Zara Larsson
Tuesday 13th November: Jess Glynne
Wednesday 14th November: Lewis Capaldi
Thursday 15th November: Blossoms
Monday 19th November: Rita Ora
Tuesday 20th November: Jax Jones
Wednesday 21st November: Christine And The Queens
Thursday 22nd November: George Ezra
Monday 26th November: The 1975
Tuesday 27th November: Rudimental and Tom Walker
Wednesday 28th November: Ellie Goulding
Thursday 29th November: Mumford and Sons - Live Lounge Symphony
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