Unter den Linden, which means "Under the Linden trees" in German, is the most iconic and recognized boulevard in Berlin, Germany. From its beginnings until World War II, it was the epicenter of Berlin's cultural life and a popular meeting point for citizens.

The history of this boulevard dates back to the 16th century, when it was created as a path by John George of Brandenburg to reach his hunting ground in the Tiergarten. In 1647, Frederick William I of Brandenburg embellished the path by planting lime trees connecting the Palace with the city gates. Later, in the 19th century, it was expanded to the west with the installation of the equestrian statue of Frederick the Great by Christian Daniel Rauch, thus becoming the grand boulevard we know today.

During the construction of the Berlin S-Bahn in 1934, many of the original linden trees were felled and the remaining ones were destroyed during the Battle of Berlin at the end of World War II. After lying in ruins since 1945, Unter den Linden was located in the eastern sector of East Berlin, which later became the capital of the GDR. The present linden trees were planted in 1950.

After the fall of the Berlin Wall and reunification, Unter den Linden has regained its importance as one of Berliners' favorite streets, alongside the Kurfürstendamm.

This wide boulevard starts at Paris Square, on the west side of the Brandenburg Gate, and runs eastward for 1.5 km, intersecting with Friedrichstraße and ending at Bebelplatz, flanked by the Humboldt University of Berlin and the German Historical Museum in the former Zeughaus, before reaching the castle bridge connecting to Museum Island.

Unter den Linden is an important meeting and recreation point, housing numerous institutions and places of cultural and tourist interest, including the famous Berlin State Opera, colloquially known as the "Lindenoper". It has been immortalized by poets such as Goethe, Schiller and Heine, who dedicated literary works to it, as well as by several songs, such as "Linden Marsch" and "Untern Linden, untern Linden".