Bias in history is a viewpoint that favors one side in an account of the past. It can appear in written, spoken, or visual sources. Bias is created by authors, historians, or groups.

A textbook, speech, or painting may present events in a way that highlights certain people or ideas while leaving out others. Records from different time periods may show different perspectives. These viewpoints can shape how events are understood.

Bias in history is studied when interpreting sources. It is part of analyzing historical information.