Kromsdorf is a village and a former municipality in the district of Weimarer Land in Thuringia, Germany. Since 1 January 2019, it is part of the municipality Ilmtal-Weinstraße. It was part of the Verwaltungsgemeinschaft Ilmtal-Weinstraße until 31 December 2013. It borders on Weimar, and is situated northeast of the city, not far from Schloss Tiefurt, on both banks of the river Ilm.