Knoop Manor, Manor house in Altenholz, Germany

Knoop Manor is a Neoclassical manor house built 1792–1796 to plans by Danish architect Axel Bundsen, its white-plastered facade turned toward the Eider Canal opened in 1784. The two-storey building is dominated by a monumental portico with an Ionic pediment; its interiors were decorated by stuccoist Francesco Antonio Taddei and painter Giuseppe Anselmo Pellicia. The estate lies in Altenholz west of Kiel-Holtenau, by the former Eider Canal and today's Kiel Canal.

Knoop was first documented in 1322, likely founded by Lupus de Knope, whose wolf appears in Altenholz's coat of arms. In the 16th century Paul von Rantzau built the water castle Arx Cnopia, surrounded by moats fed by the Levensau. In 1776 Heinrich Schimmelmann bought the estate for his daughter Caroline von Baudissin, who had the present manor house built from 1792 to 1796 and demolished the old castle.

The name Knoop means "knob" or "boss" in Low German, after Lupus de Knope, who is recorded in 1322; the wolf leaping at a tree in Altenholz's coat of arms recalls him. Around 1800 the estate, with nearby Emkendorf, was a cultural centre of Schleswig-Holstein, and Caroline von Baudissin furnished the new house with art. Today some rooms host regular cultural events, and the tea house can be used for civil wedding ceremonies.

The manor house is privately owned and can only be viewed by groups after prior arrangement; the tea house in the estate park is open to the public and can be used for civil wedding ceremonies. The former Knoop lock, the second lock of the Eider Canal after Holtenau, lay east of the estate with a folding bridge built in the Dutch style; the restored Rathmannsdorf lock, which had no bridge, stands about 3 km to the northwest.

The estate's name comes from Low German for "knob" or "hump", and probably from its founder Lupus de Knope, mentioned in 1322. His name lives on in Altenholz's coat of arms, which shows a wolf leaping up a tree. The Baudissin family lost the estate in 1869 partly because of gambling debts left by Caroline von Baudissin.