The Pictorial Key to the Tarot is Arthur Edward Waite's authoritative guide to the symbolism, history, and interpretation of the seventy-eight cards of the Rider–Waite Tarot. Written to accompany the groundbreaking deck illustrated by Pamela Colman Smith, the book explains the imagery and meanings of both the Major and Minor Arcana in detail.

Waite explores the historical development of tarot, examines earlier theories about its origins, and presents his own esoteric understanding of the cards through the lens of Western mysticism, Christian symbolism, and the Hermetic tradition. Each card is accompanied by descriptions of its symbolism, upright and reversed meanings, and practical guidance for divination.

Beyond individual card interpretations, the book introduces methods of tarot reading, including the Celtic Cross spread and other traditional layouts. It also discusses the philosophical principles underlying tarot as a symbolic system for spiritual reflection rather than merely a tool for fortune-telling.

A cornerstone of modern tarot literature, The Pictorial Key to the Tarot has shaped generations of readers and practitioners. Its combination of historical scholarship, symbolic analysis, and practical instruction continues to make it one of the most influential works on tarot ever published.