Often translated simply as "logic," the Sanskrit word nyāya means "rule of reasoning" or "method of reasoning." Texts from the school of classical Indian philosophy that bears this name are concerned with cognition, reasoning, and the norms that govern rational debate. This translation of selections from the early school of Nyāya focuses on its foundational text, the Nyāya-sūtra (c. 200 CE), with excerpts from the early commentaries. It will be welcomed by specialists and non-specialists alike seeking an accessible text that both represents some of the best of Indian philosophical thought and can be integrated into courses on Indian philosophy, religion, and intellectual culture.