Eystein Jansen (born 28 February 1953, Bergen) is a Norwegian professor in marine geology / paleoceanography at the University of Bergen and researcher and adviser at the Bjerknes Centre for Climate Research (BCCR). He headed the Bjerknes Centre from its founding in 2000 to 2013. Jansen got a MSc degree in 1981 and a PhD degree (dr.scient.) in 1984 from the University of Bergen. He was assistant and later associate professor in marine geology at the university 1985–1993 and became a full professor in 1993.