Matrix is a historical novel by American author Lauren Groff, published by Riverhead Books on September 7, 2021.

[1] Groff's fourth novel, Matrix is about a "seventeen-year-old Marie de France... sent to England to be the new prioress of an impoverished abbey, its nuns on the brink of starvation and beset by disease.

"[2] Within the novel, Marie, whom Groff writes as a lesbian,[3] turns around the abbey's fortunes and treats it as a quasi-mystical female separatist "utopia".

[5] The novel debuted at number eleven on The New York Times fiction best-seller list for the week ending September 11, 2021.

[6] Publishers Weekly, in its starred review, praised Groff's "boldly original narrative" and her "transcendent prose and vividly described settings" for bringing to life "historic events, from the Crusades to the papal interdict of 1208."