Attiswil is a municipality in the Oberaargau administrative district in the Canton of Bern in Switzerland .

Attiswil is first mentioned in 1364 as Attenswile.

The region around the Aare river was inhabited at least as early as the Mesolithic. The remains of Mesolithic, Bronze Age and La Tène settlements have been discovered in the municipality. A number of farms and villages existed in the area during the Roman era, along with a menhir or standing stone that may predate the Romans.

During the Middle Ages the village was part of the Herrschaft of Bipp.