Marion Ursula Boyars, née Asmus (26 October 1927 – 1 February 1999), was a British publisher.
She was born Marion Asmus in New York, daughter of German publisher Johannes Asmus. She attended school in New York and Switzerland, living with her mother and sister, before going on to Keele University to read for a degree in politics, philosophy and economics. After graduating, she married George Lobbenberg and had two daughters. After the marriage ended in divorce, and she was subsequently married for a second time to Arthur Boyars. in 1960 she answered an advertisement in The Bookseller that led to her buying a 50 percent stake in the small independent publishing company run by John Calder in London. The resultant publishing house, Calder and Boyars, published books by authors including Samuel Beckett, Marguerite Duras, Henry Miller, Eugene Ionesco and William S. Burroughs, until the firm split in 1975, when Boyars formed Marion Boyars Publishers, building up an eclectic list of translated fiction (by such authors as Julio Cortazar, Latife Tekin, Vasily Shukshin and Witold Gombrowicz) as wll as books on music and cinema.