Unstan ware is the name used by archaeologists for a type of finely made and decorated Neolithic pottery from the 4th and 3rd millennia BC. Typical are elegant and distinctive shallow bowls with a band of grooved patterning below the rim, a type of decoration which was created using a technique known as "stab-and-drag". A second version consists of undecorated, round-bottomed bowls. Some of the bowls had bits of volcanic rock included in the clay to make them stronger. Bone tools were used to burnish the surfaces to make them shiny and impermeable.

Unstan is a Neolithic chambered cairn located about 2 mi (3 km) north-east of Stromness on Mainland, Orkney, Scotland. The tomb was built on a promontory that extends into the Loch of Stenness near the settlement of Howe. Unstan is notable as an atypical hybrid of the two main types of chambered cairn found in Orkney, and as the location of the first discovery of a type of pottery that now bears the name of the tomb. The site is in the care of Historic Environment Scotland as a scheduled monument.