Otto Eger (19 October 1877 - 11 April 1949) was a German jurist and legal historian.
As a professor at the University of Giessen (and undertaking, more briefly, an eight year professorship at Basel), during the first half of the twentieth century, he was an influential teacher of several generations of legal scholars.
He served terms as University Rector at both institutions.
A committed nationalist, he backed National socialism which, in his judgement, opened up opportunities for revanchists who still hoped to find ways to undo the destruction of the Bismarckian German state in 1918/1919.