Una Vincenzo, Lady Troubridge (March 8, 1887 – September 24, 1963) was a British author, translator, and socialite, best known for her long-term partnership with sculptor Romaine Brooks. Born into an aristocratic family, she pursued literary work, translating French authors like André Gide and writing a biography of Radclyffe Hall. She moved in avant-garde circles in Paris and London, associating with figures such as Gertrude Stein. Her life and work have been recognized as significant in LGBTQ+ history.