Svein Nyhus (born 23 January 1962) is a Norwegian illustrator and writer of children's books. Born in Tønsberg as the twin brother of caricaturist Egil Nyhus, he took his education at the Norwegian National Academy of Craft and Art Industry from 1981 to 1985.

Nyhus has illustrated his own texts as well as books by his wife, Norwegian poet Gro Dahle. His own books include "Drømmemaskinen" (The Dream Machine, 1995), his debut work, and "Sånt som er" (Things That Are, 2010). His collaborative works with Gro Dahle include the internationally acclaimed "Sinna Mann" (Angry Man, 2003), "Snill" (Nice/What a Girl!, 2002), and "Blekkspruten" (The Octopus, 2013).

His books have been translated into several languages and have gained international recognition. In 2004 he illustrated "Why Kings and Queens Don't Wear Crowns," a picture book written by Princess Märtha Louise of Norway. In 2013, Nyhus illustrated "What Does the Fox Say?," a children's picture book based on Ylvis's YouTube hit The Fox, which debuted at number one on the New York Times Best Seller list.

Nyhus has received numerous awards for his work. In 2002, he won the Brage Prize for "Snill" with Gro Dahle, and in 2003 the Best Children's Book Prize from the Norwegian Ministry of Culture for "Sinna Mann." In 2014, he received the Norwegian Critics Prize for Literature with Gro Dahle for "Akvarium."

His distinctive artistic style has significantly influenced contemporary animation, particularly through his collaboration with filmmaker Anita Killi at Trollfilm. Nyhus's illustrations for "Sinna Mann" inspired Killi's award-winning 2009 animated adaptation "Angry Man," which won the Grand Prix at the International Animation Film Festival Hiroshima and was reportedly the most awarded film worldwide in 2010. His illustrations for "Blekkspruten" are currently inspiring Killi's upcoming animated film "Blind Octopus" (2025), which addresses the sensitive topic of sibling abuse and continues their collaborative approach to tackling difficult social themes through animation.

Nyhus is known for his bold, evocative art style that captures complex emotional landscapes, making difficult subjects accessible to both children and adults. His work consistently addresses psychological problems and interpersonal relationships with sensitivity and artistic integrity.

He lives on the island Tjøme in Vestfold with his wife Gro Dahle and continues to create impactful children's literature that resonates internationally.