The Secret Life of Pronouns is a book and accompanying website by social psychologist James W. Pennebaker, whose research examines connections between language and psychology. The project explains how ordinary, frequently overlooked words can offer clues about people’s thoughts, emotions, behavior, and relationships. It focuses on function words—including pronouns, articles, prepositions, and auxiliary verbs—which carry relatively little meaning on their own but make up more than half of everyday English.

Drawing on large-scale research and computerized analysis of hundreds of thousands of letters, poems, books, blogs, social media posts, conversations, and other texts, the book explores how word choices relate to personality, honesty, social skills, intentions, and the ways people connect with others and themselves. The website introduces the book and its central ideas, provides information about Pennebaker, and offers exercises and videos related to the subject. Visitors can also find links to online retailers selling the book. Together, the book and website present language analysis as a way to learn about social and psychological processes through the small words people use every day.