Kasteel van Obsinnich, Protected medieval castle in Voeren, Belgium.

Kasteel van Obsinnich is a red-brick castle by the Gulp near Remersdaal, in the Voeren area. A round brick tower with a tall pointed slate spire stands at the left, the front range has rows of rectangular windows and a stepped gable at its right end, and a bridge crosses the water in front. The core goes back to the Van Eynatten period, with two right-angled wings added from 1619 and a weathervane dated 1641.

Obsinnich was an allodial estate held by the Rhoe van Obsinnich family in the 14th century and by the Van Eynatten family from the mid-15th century; only elements of the understructure of that castle remain. Winand van Eynatten, lord from 1619, added two perpendicular wings, and a weathervane dated 1641 probably marks this campaign. In 1721 the estate passed to the Furstenberg family, and Baron Clément-Auguste-Egon de Furstenberg extended the central wing, rebuilt the ruined tower and raised the side gables in 1880.

The name Obsinnich, originally Opsinnich, means the place upstream from the hamlet of Sinnich. The castle gave its name to the knightly families Rhoe van Opsinnich and Van Eynatten van Opsinnich, who lived here from the 13th and 15th centuries. Since 1961 it has been a holiday centre for young people and groups under the name Castel Notre Dame.

The castle integrates well into the regional cycling network, making it accessible during a bike tour of the area. Approach via the local paths that connect easily from nearby walking routes.

The name Opsinnich means the place lies higher up, or further upstream, than the hamlet of Sinnich on the Gulp. The castle gave its name to two knightly families, the Rhoe van Opsinnich from the 13th century and the Van Eynatten van Opsinnich from the 15th, who lived here for centuries.