Eirik Newth (born 17 August 1964) is a Norwegian astrophysicist, writer of popular science for children, and media personality. He received the Brage Prize in 1996 for the children's book Jakten på sannheten.
He is the son of author and illustrator couple Philip and Mette Newth, and a maternal grandson of writer couple Fridtjof and Lalli Knutsen.