Arild Stubhaug (born 25 May 1948) is a Norwegian mathematician, poet and biographer.
Stubhaug was born in Naustdal, and is married to Kari Bøge. He made his literary debut in 1970 with the poetry collection Utkantane. He has written biographies of the mathematicians Sophus Lie, Niels Henrik Abel and Gösta Mittag-Leffler.
He received the Brage Prize in 1996 for the biography Et foranskutt lyn. Niels Henrik Abel og hans tid, translated into English under the title Niels Henrik Abel and his Times:Called Too Soon by Flames Afar,Brage Prize, 1996
Norsk språkpris, 2001
Norwegian Academy Prize in memory of Thorleif Dahl, 2008