Ørnulf Seippel (born 1962) is a Norwegian sociologist. He is currently a Researcher at Norwegian Social Research and Professor II at the Norwegian University of Science and Technology, where he was Professor of Sociology and Political Science from 2007 to 2009.
Ragnvald Ørnulf Rolsdorph Dahl (15 February 1900 – 8 December 1971) was a Norwegian military officer. He was born in Hamar, and was a brother of Arne Dagfin Dahl.