On the Parts of Animals (or De Partibus Animalium) is a text by Aristotle. It was written around 350 BC. The whole work is roughly a study in animal anatomy and physiology; it aims to provide a scientific understanding of the parts (organs, tissues, fluids, etc.) of animals.
The Arabic translation of De Partibus Animalium comprises treatises 11-14 of the Kitāb al-Hayawān (The Book of Animals).