Geidorf is the 3rd district of the Austrian city of Graz. It is located north of the first two districts I. Innere Stadt and II. St. Leonhard. In the east it stretches as far as the Landeskrankenhaus Universitätsklinikum and towards the west it borders the river Mur. As the main campus of the University of Graz is located in Geidorf, many students and professors live here. It had a population of 23,847 in January 2023 and covers an area of 5.5 square kilometres.