Four hundred years ago, boy actors played the female characters on the British stage. But when UK radio was established a century ago, it was often the other way around: women played the boys. This continued almost until the turn of the millennium but has been a largely hidden history, with many of the actresses billed in such a way as to not reveal their gender. This article argues that these vocal performances are a specific adaptation technique and particularly focuses on its use in BBC Radio adaptations of Shakespeare plays. By examining contemporary accounts and existing audio recordings, it establishes what these women sounded like and the reaction of critics to their portrayals. It also compares these female performances in boys’ roles with productions where genuine children were used, exploring why producers frequently chose adult women over young boys to play these parts and why the public appears to have accepted their voices in these roles. This unacknowledged tradition of acting has taken place for generations in an organization where cross-gender casting in adult Shakespearean roles is very rare. This article reclaims these roles for the women who played them.