This entry on Maß (moderation, measure) explores a concept that has not received much attention in Goethe scholarship and makes a case for its usefulness and versatility in tracking how Goethe addresses a philosophical issue with a history stretching at least back to Aristotle’s conception of “the golden mean.” It shows how Goethe’s writings respond to numerous issues connected with the concept of moderation, ranging from the problem of self-moderation, when an individual’s own internal calibration comes in conflict with societal norms, to the more theoretical question of how to define the correct standard of measure (Maßstab). The discussion of moderation in Goethe’s work is, to be sure, coupled with its opposite, namely the potentially deadly threat of immoderation and excess, such as one finds in Die Leiden des jungen Werthers (1774; The Sorrows of Young Werther), Wilhelm Meisters Lehrjahre (1795; Wilhelm Meister’s Apprenticeship), and Torquato Tasso (1790). Such potential conflicts, which also raise questions of where to position the standard of measure (Maßstab) of behavior, lead naturally into contexts of scientific experimentation, as in Goethe’s essay “Der Versuch als Vermittler von Objekt und Subjekt” (1792; The Experiment as Mediator of Object and Subject), where such standards take on a different valence from their role in mathematically based natural sciences. In addition, Goethe’s novel, Die Wahlverwandtschaften (1809; Elective Affinities), provides a poetic model where conflicts between individually and socially calibrated notions of measure and moderation play out with major ethical consequences. The entry concludes with a reflection on different kinds of aesthetic experience, each with its particular understanding of Maß: the individual’s appreciation of the sublime, the theatrical performance, and the embodiment of the self through poetic meter. Throughout these examples, the entry will underscore the role of narrative constraints: regardless of whether the medium is prose or poetry, one finds that questions of Maß as moderation in Goethe’s writings are often accompanied by questions of narrative control and excess. The following overview and analysis of Maß in Goethe’s writing will show that this term is a nodal point of ethical, epistemological, and aesthetic concerns.