Burg Bommersheim, Medieval castle ruins in Bommersheim, Germany.

Burg Bommersheim is a castle ruin featuring the remains of a stone ring wall and foundations uncovered through systematic archaeological work starting in 1988. The site displays the layout of a fortified structure built to control and defend the surrounding landscape.

The oldest part is a motte with a 20–25 m base and a wooden tower, dated to the 11th–12th century by a painted Pingsdorf ware sherd. In the 13th century it was replaced by a lowland castle with a 1.70 m thick ring wall enclosing about 1000 m², similar to nearby Burg Bonames. In the last quarter of the 13th century it passed to the heirs of Werner II. Schelm von Bommersheim as a Ganerbenburg. Finds include crossbow bolts and basalt cannonballs from its siege.

The castle served as a seat of local power and shaped the character of the village for generations. The uncovered pottery and tools scattered across the site tell stories of how people lived and worked within these walls.

The ruins are located behind the Church of St. Aureus and Justina on the eastern edge of Bommersheim, within walking distance of the village center. The ground is uneven in places and can become slippery after rain, so sturdy footwear is recommended.

The waterlogged soil in the castle's moat preserved organic materials like bone and wood in unusual detail, giving archaeologists rare insights into daily life that would normally decompose. This natural preservation allowed researchers to recover information about the inhabitants that few other ruins can provide.