Neck ruff is a style of neckwear that was popularized in the early 20th century. The style is characterized by a ruffled, standing neckwear, typically made of cloth, wool, or silk. Neck ruffs can also be made of hair, feathers, or fur.

One of the earliest references to neck ruffs can be found in the early 16th century, in the work of mathematician and artist Leonardo da Vinci. He described a hairstyle characterized by a tall ruff around the neck.