The Marcomannic Wars (called by the Romans bellum Germanicum or expeditio Germanica) are a series of wars lasting over a dozen years from about 166 until 180.

These wars pit the Roman Empire against the Marcomanni, Quadi and other Germanic peoples, along both sides of the upper and middle Danube.

The struggle against the Germanic invasions occupies the major part of the reign of Roman emperor Marcus Aurelius, and it is during his campaigns against them that he starts writing his philosophical work Meditations, whose first book bears the note "Among the Quadi at the Granua".