Tamsyn Elizabeth Muir is a New Zealand author known for her work in fantasy, science fiction, and horror. She is best recognized for The Locked Tomb, a science fantasy series that has gained significant attention in the literary community. Muir's debut novel, Gideon the Ninth, was published to critical acclaim and won the 2020 Locus Award. The success of this first work established her as a notable voice in contemporary speculative fiction. Beyond her debut, she has received multiple award nominations, reflecting the recognition of her contributions to the genre.