Joanna Lloyd, pseudonym for Joan Coggin (1898–1980), was a British author known for writing detective novels under her own name and girls' school stories under her pen name. Her works under the Joanna Lloyd moniker catered to young readers, offering engaging narratives set in boarding school environments. Though less documented than her detective fiction, these stories reflected her versatility across genres.
Born in Papua New Guinea, Lloyd spent her formative years attending boarding school in Sydney, Australia. With a background in psychology, she later trained as a mediator, specializing in workplace and family law disputes. After muscular dystrophy confined her to a wheelchair, she channeled her keen interest in human behavior into writing. Residing in Far North Queensland, Australia, she found inspiration in her tropical surroundings, which she often described as her personal paradise.