Karstein Seland (5 January 1912 - 13 January 2005) was a Norwegian politician for the Centre Party.
He was born in Gyland.
He was elected to the Norwegian Parliament from Hedmark in 1965, and was re-elected on one occasion. He had previously served in the position of deputy representative during the term 1961 - 1965, during which he briefly replaced Karen Grønn-Hagen who was appointed to the short-lived cabinet of John Lyng.
Seland was involved in local politics in Vinger and Kongsvinger municipalities between 1958 and 1967.