Scrimshaw refers to a type of hand made craft created by carving the teeth and bones of whales and other marine mammals. It was traditionally created by sailors during the height of whaling in the 19th century, though scrimshaw may also be created by hobbyists. Anyone who makes scrimshaw is called a scrimshander.

The earliest scrimshaw consisted of tools for use on the ship. The abundance of whale teeth and bones on a whaling ship, combined with the significant free time of whalers, who had no work to do at night, created the perfect environment for the art of scrimshaw to arise. Whale bones are also a fairly easy material to work with.

Scrimshanders soon began crafting more artistic pieces, either for personal use or for sale at the market. Most scrimshaw is simply decorative and preserves the shape of the tooth or bone, while the surface is covered with carving and lettering. The first piece of scrimshaw fitting this description dates from 1817 and offers a narrative describing where and when the whale it came from was caught. Like much scrimshaw, it is anonymous. Whaling and other nautical scenes, naturally, are a popular subject for scrimshaw, though other designs are often seen as well. Scrimshaw may also take the form of tools, toys, or jewelry.

The manufacture of scrimshaw quickly tapered off as the practice of whaling declined, and the ban on commercial whaling in the 1980s heralded the end of traditional scrimshaw. However, some crafters still make scrimshaw using material other than bone. Original scrimshaw is very valuable, and many museums have scrimshaw collections. The Nantucket Whaling Museum and the New Bedford Whaling Museum in Massachusetts, the Kendall Whaling Museum in Connecticut, and the Hull Maritime Museum in Kingston upon Hull, England all hold impressive collections of scrimshaw, but many other museums have smaller collections.

In the United States, modern scrimshaw may be made with pre-embargo ivory, which entered the country before sanctions took effect. Other popular materials include hippo ivory from hippos that have been killed for other reasons, fossilized ivory from mastodons and ancient walrus, antlers - which animals shed yearly, and nut palm or "vegetable ivory." This type of scrimshaw is sometimes called fakeshaw, but it is the only feasible and environmentally sound way to carry on the art form.