Medieval reenactment is a form of historical reenactment that focuses on re-enacting European history in the period from the fall of Rome to about the end of the 15th century. The second half of this period is often called the Middle Ages. This multiplicity of terms is compounded by the variety of other terms used for the period.

The first period is sometimes called the Migration Period or Dark Ages by Western European historians, and as Völkerwanderung ("wandering of the peoples") by German historians. This term is usually reserved for the 5th and 6th centuries. Re-enactors who re-create the next period of history - 7th to 11th centuries - often refer to this as Early medieval. The 12th to 14th centuries fall under the term High medieval, while the 15th century is often termed Late medieval.

With such a wide range of eras most medieval reenactment groups focus on a smaller time period, sometimes restricting their interest to a particular century, or even a specific decade, series of battles, or monarch, depending on how authentic the reenactment and encampment is intended to be.