Lucy Amelia Nancy Moss (born 13 January 1994) is a British writer, director, and composer best known for co-creating the hit musical Six with Toby Marlow. As director of most Six productions, Moss became the youngest ever female director of a Broadway musical at 26. For its West End run, Six was voted Best New Musical of the Decade by readers of WhatsOnStage and received five Olivier Award nominations. Nominated for a Tony Award for Best Direction of a Musical with Jamie Armitage, Moss alongside Marlow won the Tony Award for Best Original Score in 2022.