My dissertation offers insights into gender-bending, travesti, and "disguise" roles in eighteenth-century Italian opera seria in London, specifically in Handel's operas. These matters have been discussed at length in regards to the controversial figure of the castrato; however my writing offers particular attention to women's bodies and voices both on stage and in the public imagination. The real or perceived gendered transgressions and excesses of eighteenth-century Italian opera, rooted in the figure of the castrato and his female counterpart, the dangerously masculinized diva, were known to have provoked paranoid conspiracy theories and anxieties circulating in a wide array of English satirical pamphlets that bear a striking resemblance to modern tabloids. This dissertation offers a survey of these gendered anxieties through a series of case studies about four different Handel operas spanning his London career. I address these issues from a variety of different angles including the aforementioned satirical pamphlets and related archival materials, a feminist critique of the Enlightenment ideology of Reason, a discussion of waning mechanistic philosophies and theories of the body and subjectivity in relation to the female singer's voice and vocal agency, as well as issues pertaining to contemporary opera production and reception. *All Figures in Chapter Two are still images taken from the Negrin (Copenhagen 2009) staging of Partenope (see bibliography). ** All Figures in Chapter Three are still images taken from the Morabito/Wieler staging (Stuttgart 1999/2000) of Alcina (see bibliography). ***All Figures in Chapter Four are still images taken from the Alden (Amsterdam 2012) staging of Deidamia (see bibliography).