This book offers a comprehensive and systematic - rather than historical - approach to ancient Greek oracular texts, showing their conceptual and formal unity and patternisation, as well as their meaningful diversity. It provides even coverage of both oracular texts ascribed to major institutions, including Delphi, Dodona, Didyma, Clarus, and Abonoteichus, and those attributed to mythical poets such as the Sibyl, Bacis, and Musaeus.