客体（英语：Object）指可感知或可想像到的任何事物，既包括客观存在并可观察到的事物（如树木、房屋，抽象的如物价、自由），也包括想像的事物（如神化人物）。

An object is a technical term in modern philosophy often used in contrast to the term subject. A subject is an observer and an object is a thing observed. For modern philosophers like Descartes, consciousness is a state of cognition that includes the subject—which can never be doubted as only it can be the one who doubts–—and some object(s) that may be considered as not having real or full existence or value independent of the subject who observes it. Metaphysical frameworks also differ in whether they consider objects exist independently of their properties and, if so, in what way.