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Flint biface from Saint-Acheul, France. (20 cm high)

In archaeology, a biface is a two-sided stone tool, manufactured through a process of lithic reduction, that displays flake scars on both sides. A profile view of the final product tends to exhibit a lenticular shape (i.e., as a convex lens). Bifacial artifacts can be made on large flakes or blocks, and may be grouped into numerous distinct classes. For the purposes of this article, four classes are defined :

• Class I consists of large, thick bifaces reduced from cores or thick flakes; these are referred to as blanks.
• Class II consists of thinned blanks. While form remains rough and uncertain, an effort has been made to reduce the thickness of the flake or core.
• Class III bifaces may be either preforms or crude formalized tools, such as adzes.
• Class IV includes the finer formalized tool types such as projectile points and fine bifaces.

It must be emphasized that, while Class IV bifaces are referred to as "formalized tools", bifaces from any stage of a lithic reduction sequence may be used as tools. (Also, other biface typologies make five divisions rather than four).

Examples of bifaces include Acheulean industries that appear in East Africa about 1.6 million years ago, for instance in Olduvai Gorge. They are also known in Mousterian industries. In North America, bifaces make up one of the dominant tool industries, starting from the terminal Pleistocene and continuing throughout the Holocene. For example, the Folsom point and Clovis point traditions (collectively known as the fluted points) are associated with Paleo Indians, some of the first people to colonize the new world (see Models of migration to the New World). Further, biface technology is almost unknown in Australian prehistory.

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