While indeterminacy is a recurrent theme in philosophy, less progress has been made in clarifying its significance for various philosophical and interdisciplinary contexts. This collection brings together early-career and well-known philosophers—including Graham Priest, Trish Glazebrook, Steven Crowell, Robert Neville, Todd May, and William Desmond—to explore indeterminacy in greater detail. The volume is unique in that its essays demonstrate the positive significance of indeterminacy, insofar as indeterminacy opens up new fields of discourse and illuminates neglected aspects of various concepts and phenomena. The essays are organized thematically around indeterminacy’s impact on various areas of philosophy, including post-Kantian idealism, phenomenology, ethics, hermeneutics, aesthetics, and East Asian philosophy. They also take an interdisciplinary approach by elaborating the conceptual connections between indeterminacy and literature, music, religion, and science.