Eystein Weltzien (born 14 December 1949) is a Norwegian orienteering competitor.

He is Relay World Champion from 1978 as a member of the Norwegian winning team,[1][2] as well as having bronze medal from 1974.

He also had a position as trainer for the Norwegian national orienteering team in the 1980s.

Weltzien was awarded Egebergs Ærespris in 1975, for excel in both orienteering and cross-country skiing.

His children Audun and Ingunn Hultgreen Weltzien compete in orienteering on an international level.