**Abstract**

Paranasal sinuses are paired cavities within the skull, which develop by evagination into the spongy bone between the external and internal plates of the cranial and facial bones. Thus, each sinus is lined by respiratory epithelium and has direct or indirect communication to the nasal cavity. The purpose of this chapter is to present an anatomical reference guide of the paranasal sinuses in domestic animals, including large and small ruminants (cattle, buffalo, sheep, and goats), camels, canines (dog) and equines (horse and donkey), appropriate for use by anatomists, radiologists, clinicians, and veterinary students. Topographic descriptions and the relationships between the various air cavities and paranasal sinuses have been visualized using computed tomography and cadaver sections images. The anatomical features (including head bones, muscles, and soft tissues) have been compared using both dissected heads and skulls and computed tomography images. This chapter will therefore be useful as a normal reference guide for clinical applications.

**Keywords:** paranasal sinuses, morphology, computed tomography, domestic animals
