Lucy May Barker (born 4 April 1992) is a British stage and screen actress.

She was born and brought up in Lincoln, Lincolnshire. Most notably, Barker played Ilse in the original London cast of the four-time Olivier Award-winning Spring Awakening which opened in February 2009 at the Lyric Hammersmith. The show transferred to the Novello Theatre in March 2009, and ran until May 2009.

In the 2001-2003 tours of the musical Annie, Barker played the title role to critical acclaim. In 2009, she also appeared in the London premiere of the musical Zombie Prom at the Landor Theatre, playing Ginger, and in The Impressions Show with Culshaw and Stephenson playing George, one of the Famous Five, with the comedian Jon Culshaw.

In 2010, Barker appeared at the Royal National Theatre playing Millie in Really Old, Like Forty Five, a new play by Tamsin Oglesby. The play opened on 3 February, following previews from 27 January 2010, in the Cottesloe, and was directed by Anna Mackmin. The play also starred Gawn Grainger, Judy Parfitt and Marcia Warren.