This chapter provides detail description of sonography of neck. Chapter has 27 well illustrated diagrams and pictures. Anatomy and technique for thyroid gland, diffuse thyroid disease, focal thyroid nodules, neoplastic neck lymphadenopathy, cystic hygroma, thyroglossal duct cyst, hemangioma, malignant tumors on ultrasound of neck are described in detail with the help of excellent ultrasonographic illustrations and pictures. 15 references are given at the end of the chapter for further reading.