Der Ring des Nibelungen (The Ring of the Nibelung) is a cycle of four epic music dramas by the German composer Richard Wagner. The operas are based loosely on characters from the Norse sagas and the Nibelungenlied. The works are often referred to as "The Ring Cycle", "Wagner's Ring", or simply "The Ring".

Wagner wrote the libretto and music over the course of about twenty-six years, from 1848 to 1874. The four operas that constitute the Ring cycle are, in the order of the imagined events they portray:

• Das Rheingold (The Rhinegold)
• Die Walküre (The Valkyrie)
• Siegfried
• Götterdämmerung (Twilight of the Gods)

Although individual operas are performed as works in their own right, a full understanding of the story of the Ring cycle requires attendance at all four operas, which was the intention and expectation of the composer.