Großer Inselsberg is a mountain in the Thuringian Forest with a height of above sea level, located on Rennsteig in the districts of Gotha and Schmalkalden-Meiningen. It is the fourth-highest distinct mountain of Thuringia, after Großer Beerberg (), Schneekopf () and Großer Finsterberg () and forms a landmark that can be viewed in particular from northern and western directions.