Roar Arntzen (born 23 November 1947) is a Norwegian engineer.
He grew up in Rosenborg and Byåsen, and took the siv.ing. degree at the Norwegian Institute of Technology in his hometown. He was hired as a researcher in SINTEF in 1971, an institute for technical and industrial research. In 1977 he was hired as a chief engineer in Autronica, where he served five years as chief executive from 1984 to 1989, when he became director of the SINTEF company Elab-Runit. He advanced further to vice chief executive of SINTEF in 1991 and chief executive in 1995. He was first acting chief executive for some months before being hired on a permanent basis in November 1995. In March 2002 he was announced as the new chief executive of St. Olav Hospital.[1][2][3][4][5] He resigned in March 2006, and was succeeded by Gunnar Bovim.[6][7]
Arntzen chairs Renholdsverket[8] and has chaired Trondheim Symphony Orchestra. He is a member of the gentlemen's club Harmonien.[9] He is a fellow of the Norwegian Academy of Technological Sciences.[10]
As of 2020, he sits on the board of directors for 5 companies and currently serves as the director of Trondheim Parkering, a parking company.[11][12]