陰蝨（Pthirus pubis），俗稱三角蝨，係一種寄生喺人體毛髮嘅寄生蟲，長約1至3毫米，冇翼。因常見於陰部，所以叫做陰蝨。
The pubic lice (Pthirus pubis), commonly known as the triangular lice, is a parasite that lives on human hair, about 1 to 3 mm long, without wings. Because it is commonly found in, it is called pubic lice.