Knowledge of one's own sensations, desires, intentions, thoughts, beliefs, and other attitudes is characteristically different from other kinds of knowledge: it has greater immediacy, authority, and salience. This volume offers a powerful and comprehensive look at current work on this topic, featuring closely interlinked essays by leading figures in the field that examine philosophical questions raised by the distinctive character of self-knowledge, relating it to knowledge of other minds, to rationality and agency, externalist theories of psychological content, and knowledge of language.