Villa Schaaffhausen, Historicist villa in Rommersdorf, Germany.

Villa Schaaffhausen is a castle-like complex on the Möschbach in Bad Honnef's Rommersdorf district, at Schaaffhausenstraße 5, on ground rising west to east toward the Korferberg. Its present form dates from 1843 to 1870: a Tudor-style north section of 1843, a south wing of 1856, and the tower with a third storey added toward the courtyard in 1865.

The estate's foundations came together around 1770 when two vineyard plots were merged and an old stone tower was removed, which had marked earlier fortified structures. The present villa was constructed later as a grand historicist residence.

Hermann Schaaffhausen's scientific reputation drew high representatives of the military, church and nobility to the villa in the 1870s, among them the later Kaiser Wilhelm II, who is said to have planted the "Kaisereiche" in the nearby Annatal during a visit in 1876. The Queen of Sweden also spent occasional holidays here from 1892 to 1906.

The villa stands at Schaaffhausenstraße 5 in the Rommersdorf district, on ground rising eastward toward the Korferberg. Major renovation of the vacant building and construction of four apartment blocks on the grounds began in the second quarter of 2021. The park west of the villa is to be restored and opened to the public; check access before setting out.

The round temple on the grounds is a Monopteros built in 1874, after the death of Hermann Schaaffhausen's wife; he died in 1893. Its base is a grotto open on four sides and clad in lava stone. The villa, the 1776 half-timbered former wine estate and the park are listed monuments, entered in Bad Honnef's register on 26 April 1984.