A pigtail is a hairstyle where hair is gathered and tied into one or two bunches that stick out from the head, often at the sides or back. The bunches might hang down loose, be braided, or twisted.

Pigtails have been worn throughout history by people of all ages in many different cultures. In some countries, like China, men traditionally wore a single pigtail down their backs. Today, pigtails are most commonly seen on young children, though anyone can wear them. Athletes sometimes choose pigtails because they keep hair out of the way during games or practices.

The word can also refer to a short, twisted piece of wire or cable. Electricians use pigtail connectors to join wires together safely. This technical meaning comes from the coiled, twisting shape that resembles the hairstyle.