The Land of Smiles is a romantic operetta in three acts by Franz Lehár. The German language libretto was by Ludwig Herzer (de) and Fritz Löhner-Beda. The performance time is about 100 minutes.

This was one of Lehár's later works, and has a bittersweet ending which the Viennese loved. The title refers to the Chinese custom of smiling, whatever happens in life. (The leading character, Prince Sou-Chong has a song early in the show, "Immer nur lächeln" ("Always smiling") which describes this.)

The work was originally produced under the title Die gelbe Jacke (The Yellow Jacket). This was presented at the Theatre an der Wien, Vienna, on 9 February 1923 with Hubert Marischka as Sou-Chong. It was not a great success, and Lehár later revised it, under the new title of Das Land des Lächelns, which was first performed, at the Metropol Theatre, Berlin, on 10 October 1929. Tauber reprised his role in London (1931 and 1932) South Africa (1939) and New York (1946), as well as in Vienna in 1930 (again at the Theatre an der Wien) and in 1938 (at the Vienna State Opera and also in Prague). Tauber also sang it in London and on tour throughout Britain between 1940 and 1942.

Sadler's Wells Opera produced it in London in the late 1950s, after the success of Lehár's The Merry Widow starring June Bronhill had rescued the company from bankruptcy. Starring Charles Craig, Elizabeth Fretwell and Bronhill, the show didn't attract the same audiences as The Merry Widow. However, Craig's singing on a recording is outstanding, with some top D♭ notes at the end of his big numbers.