Kreuzlingen is a municipality in the district of Kreuzlingen in the canton of Thurgau in north-eastern Switzerland. It is the seat of the district and is the second largest city of the canton, after Frauenfeld, with a population of over 18,000. Together with the adjoining city of Konstanz just across the border in Germany, Kreuzlingen is part of the largest metropolis on Lake Constance with a population of almost 120,000.
In 1874, the municipality of Egelshofen was renamed Kreuzlingen. It reached its present size with the incorporation of Kurzricken bach in 1927 and Emmishofen in 1928
