Schloss Stammheim, Château in Stammheim district, Cologne, Germany.

Schloss Stammheim was a two-storey Rococo mansion with a high mansard roof, built around 1780 and attributed to architect Johann Georg Leydel. Its main block of nine by four axes had wings of three by two axes on the Rhine side. Only a profiled entrance frame with a double coat of arms survives, reused in the Ulrich-Haberland-Haus.

A royal court existed at Stammheim by the end of the first millennium; in 959 Archbishop Bruno gave it to the Cologne abbey of Groß St. Martin. The castle itself is first documented in 1083, and from 1136 it was the seat of the knights von Stammheim. Around 1780 Friedrich Ferdinand von Scharffenstein built the Rococo palace, attributed to architect Johann Georg Leydel. In 1928 the city of Cologne bought it; a 1944 air raid burned it out.

The name Stammheim appears in records as Stamhem, Stampheym and Stamel. The last male of the knightly Stammheim line, Johann, lived here in the 17th century; his daughter Maria married Wimar von der Sülzen in 1637 and brought the castle into the marriage. She died in 1698.

The palace itself no longer stands; only a profiled entrance surround with a double coat of arms in the keystone survives, reused on the Ulrich-Haberland-Haus. The 1832 park laid out by Maximilian Friedrich Weyhe is freely open to the public and holds a sculpture park since 2002. A stone lion marks the start of the lime avenue that once led to the palace.

The palace burned out in a 1944 air raid and its two-storey masonry ruin stood on the right bank of the Rhine until the early 1950s. Only a profiled entrance surround with a double coat of arms in the keystone survives, reused when the Ulrich-Haberland-Haus was built.