Trazegnies Castle, Protected medieval castle in Courcelles, Belgium.

Trazegnies Castle is a brick and stone fortress in Courcelles, Hainaut. Its entrance gatehouse has a central round-arched passage flanked by two round towers banded in red brick and grey stone, with a steep slate roof and small dormers. The lower part of this gatehouse dates from the 13th century, and the castle retains Romanesque and Gothic cellars.

The castle was founded in the 11th century by Gilles I as a regional stronghold. French forces destroyed it in the 1550s, after which it was reconstructed and gradually transformed into the residence that stands today.

The castle is open to the public on designated days, and the Friends of Trazegnies Castle, founded in 1926 on the initiative of architect Marcel Simon, still runs visits and upkeep. The association took over a ruin that was nearly demolished after being photographed, and it managed the monument for a century before agreeing in 2026 to sell it to the municipality of Courcelles.

Visits are guided tours arranged by the Friends of Trazegnies Castle organization and require advance booking by phone. Plan ahead to secure your spot and expect to walk through multiple rooms and levels during your visit.

The castle was derelict by 1926 and had suffered severe damage from subsidence caused by underground mining; demolition was even considered after photographing it. Architect Marcel Simon then founded the Friends of Trazegnies Castle association, which began restoration with support from the Walloon Region.