Tiefland (or The Lowlands) is an opera in a prologue and three acts by Eugen d'Albert, to a libretto in German by Rudolph Lothar. Based on the 1896 Catalan play Terra baixa by Àngel Guimerà , Tiefland was d'Albert's seventh opera, and is the one which is now the best known.
Tiefland was first performed on November 15, 1903 at the Neues Deutsches Theater in Prague, with only limited success. Part of the reason for the lukewarm reception may have been because the house's leading dramatic tenor, Wilhelm Elsner, had died suddenly not too long before the opera's premiere, forcing another singer to learn and perform the role of Pedro in a relatively short amount of time.