Edmund Husserl (1859—1938) was an influential thinker of the first half of the twentieth century. His philosophy was heavily influenced by the works of Franz Brentano and Bernard Bolzano, and was also influenced in various ways by interaction with contemporaries such as Alexius Meinong, Kasimir Twardowski, and Gottlob Frege. In his own right, Husserl is considered the founder of twentieth century Phenomenology with influence extending to thinkers such as Martin Heidegger, Jean-Paul Sartre, Maurice Merleau-Ponty, and to contemporary continental philosophy generally. Husserl’s philosophy is also being discussed in connection with contemporary research in the cognitive sciences, logic, the philosophy of language, and the philosophy of mind, as well as in discussions of collective intentionality. At the center of Husserl’s philosophical investigations is the notion of the intentionality of consciousness and the related notion of intentional content (what Husserl first called ‘act-matter’ and then the intentional ‘noema’). To say that thought is “intentional” is to say that it is of the nature of thought to be directed toward or about objects. To speak of the “intentional content” of a thought is to speak of the mode or way in which a thought is about an object. Different thoughts present objects in different ways (from different perspectives or under different descriptions) and one way of doing justice to this fact is to speak of these thoughts as having different intentional contents. For Husserl, intentionality includes a wide range of phenomena, from perceptions, judgments, and memories to the experience of other conscious subjects as subjects (inter-subjective experience) and aesthetic experience, just to name a few. Given the pervasive role he takes intentionality to play in all thought and experience, Husserl believes that a systematic theory of intentionality has a role to play in clarifying and founding most other areas of philosophical concern, such as the theory of consciousness, the philosophy of language, the philosophy of logic, epistemology, and the philosophies of action and value. This article presents the key elements of Husserl’s understanding of intentionality and intentional content, specifically as these are developed in his works Logical Investigations and Ideas Pertaining to a Pure Phenomenology and to a Phenomenological Philosophy. . . .