Josephine Stephenson (b. 1990) is a Franco-British musician living in London.

Josephine's music has been performed by gambist Liam Byrne, violist Stephen Upshaw, violinists Eloisa-Fleur Thom and Fiona Monbet, s t a r g a z e, explorensemble, The Hermes Experiment, the Van Kuijk Quartet, the Britten-Pears Contemporary Ensemble, Ensemble Miroirs Étendus, Outcry Ensemble, The Erebus Ensemble and the Maîtrise de Radio France among others. It has been commissioned by Radio France, BBC, Spitalfields Festival, Nonclassical, Bristol Proms, Dulwich Picture Gallery, National Portrait Gallery, Miroirs Étendus, Listenpony and broadcast on France Musique, BBC Radio 3 and 6 Music, Resonance FM, and appeared on television channels BBC Two and Four.

She has collaborated with theatre companies L'Éventuel Hérisson Bleu (Les Constellations - une théorie, produced by Miroirs Étendus and Lille Opera) and FellSwoop Theatre (Ghost Opera, supported by the Festival d'Art Lyrique d'Aix-en-Provence, Aldeburgh Festival and LOD festival). She makes music for films (including Emma, Change the Locks, directed by Julia Hart and starring Olivia Williams, 'Best Composer' at Underwire Festival 2015), and sometimes assists film composers Dario Marianelli and Benjamin Wallfisch. She also enjoys working with songwriters and bands, and wrote three orchestral arrangements for the David Bowie Prom at the Royal Albert Hall in 2016, collaborating with artists including Paul Buchanan (The Blue Nile) and Conor O'Brien (Villagers). She is an Artistic Director and resident composer of the London-based concert production company Listenpony, which puts on events mixing contemporary classical music with traditional classical music and popular styles. 

Josephine is a graduate of Clare College, Cambridge, where she read Music and studied composition with Giles Swayne, and the Royal College of Music, where she was a Richard Carne scholar and completed her Masters in Composition under Kenneth Hesketh. She has participated in masterclasses led by composers such as Samuel Adler, Mark-Anthony Turnage, Colin Matthews, Oliver Knussen and Ivan Fedele. She was a Britten-Pears Young Artist 2015/16.