The Nibelungenlied, translated as The Song of the Nibelungs, is an epic poem in Middle High German. The story tells of dragon-slayer Siegfried at the court of the Burgundians, how he was murdered, and of his wife Kriemhild's revenge.

The Nibelungenlied is based on pre-Christian Germanic heroic motifs (the "Nibelungensaga"), which include oral traditions and reports based on historic events and individuals of the 5th and 6th centuries. Old Norse parallels of the legend survive in the Völsunga saga, the Prose Edda, the Poetic Edda, the Legend of Norna-Gest, and the Þiðrekssaga.

In 2009, the three main manuscripts of the Nibelungenlied were inscribed in UNESCO's Memory of the World Register in recognition of their historical significance.

The poem in its various written forms was lost by the end of the 16th century, but manuscripts from as early as the 13th century were re-discovered during the 18th century. There are thirty-five known manuscripts of the Nibelungenlied and its variant versions. Eleven of these manuscripts are essentially complete. The oldest version however seems to be the one preserved in manuscript "B". Twenty-four manuscripts are in various fragmentary states of completion, including one version in Dutch (manuscript 'T'). The text contains approximately 2,400 stanzas in 39 Aventiuren. The title under which the poem has been known since its discovery is derived from the final line of one of the three main versions, "hie hât daz mære ein ende: daz ist der Nibelunge liet" ("here the story takes an end: this is the lay of the Nibelungs"). Liet here means lay, tale or epic rather than simply song, as it would in Modern German.