Elias Gottlieb Oscar Egede Nissen (31 October 1843 – 4 January 1911) was a Norwegian physician, newspaper editor and politician.

In the aftermath of the death of founder Asbjørn Kloster, he chaired the temperance organization Det norske Totalavholdsselskap from 1879 to 1887.

At a meeting arranged by the Norwegian Students' Society on 17 November 1887, Nissen had made the claim that from his personal experience, only 10% of women had libido.

[3] He was lambasted by activist Ragna Nielsen, who tried, unsuccessfully, to channel her protest through the recently established (1884) Norwegian Association for Women's Rights.

It occurred in October 1889 when three hundred match factory workers, all female, laid down their work.

They demanded a slight pay raise of 1 øre extra per gross packed as well as better sanitary conditions.

Nissen was especially concerned about the danger of contracting phossy jaw, and famously spoke at a public meeting together with Bjørnstjerne Bjørnson.