犬齿，俗称尖牙，是很多哺乳动物口腔中，位于门齿和臼齿之间的牙齿。每侧上下颚各有一枚，一共四枚。

犬齿的外形一般呈尖锥形，其牙根比门齿长而粗大，深入牙槽骨中。犬齿因其形状，犬齿更适用于穿刺和撕裂食物而不是咀嚼。

In mammalian oral anatomy, the canine teeth, also called cuspids, dog teeth, fangs, or (in the case of those of the upper jaw) eye teeth, are relatively long, pointed teeth. However, they can appear more flattened, causing them to resemble incisors and leading them to be called incisiform. They developed and are used primarily for firmly holding food in order to tear it apart, and occasionally as weapons. They are often the largest teeth in a mammal's mouth. Most species that develop them normally have four per mammal, two in the upper jaw and two in the lower, separated within each jaw by its incisors; humans and dogs are examples. In most species, canines are the anterior-most teeth in the maxillary bone.