Øbjerggaard is a manor house and estate situated east of Køng, midway between Næstved and Vordingborg some 90 km (56 mi) south of Copenhagen, Denmark.

One of 12 new manors created when Vordingborg Cavalry District was dissolved in 1774, it was initially the site of a textile factory established by Niels Ryberg.

The area where Ny Øbjerggaard stands today was listed in records from 1682 (Markbogen and Græsningsbogen) as Øebiergs aggere ('Øbjerg Field').

Øbjerggaard was sold to Ditlev Staal, owner of Klintholm Manor on Møn.

Øbjerggaard was sold to Ditlev Staal, owner of Klintholm Manor on Møn.

On 31 December 1778, it became clear that Staal had acted as a straw man on behalf of the prominent Copenhagen-based businessman Niels Ryberg.

On 3 January 1776, Ryberg published a report on the economic advantages of promoting local industry in Denmark.

It was probably at this point that Ryberg had conceived the idea of starting a textile mill on the Øbjerggaard estate.

The buildings included a dairy, barn, stable, brewery and a forge as well as a forester's house situated a little further to the north.

The factory employed 25 weavers, 9 heglere, 14 spoolers and three other workers as well as 370 spinning women in the area.

The factory was the largest supplier of home textiles and linen to the royal court but the products were also exported to the West Indies and America.

Their eldest daughter Ulricha was married to professor of medicine Sophus Engelsted [da].

Buchwald constructed a new main building on the site of the home farm at the other end of the tree-lined avenue.

It was a one-storey building, 17 bays wide and 16 ells deep, with a red tile roof.

His father Christian Sonne (1859–1941), a politician, had first been manager of Knuthenborg Avlsgård and later Rosenlund at Sakskøbing.

In 1933, Sonne commissioned local master carpenter H. P. Nielsen to expand the entire building by one storey.