Lars Lassen[1] (1761 – 6 June 1823) was a Danish landowner, proprietor, chamber councilor "kammerråd" and agricultural commissioner.

[3] Lassen owned the estates Benzonseje (Risbyholm), Rosengård, Adamshøj, Egholm, Krabbesholm and Meilgaard.

Lars Lassen, like his father, had a great interest in agriculture and management on farms, and in 1787 he worked for his sister Kirstine and brother-in-law Jacob Rosted as a "Servant Clerk"[8] In 1789 he married Johanne Kirstine Meyer, daughter of procurator Peter Simonsen Meyer and Ingeborg Margretha Dørup.

[10] The following year, as a result of financial difficulties, David Brown began to auction off and subdivide the land.

In the Deed and Mortgage Protocol it can be read that Lars Lassen sold a large part of his properties to the former tenants farmers.

He was interviewed by the agricultural economist Greger's Otto Bruun Begtrup's for his book on Operation for the state of agriculture in Zealand and Møen, where Lassen talks about his experience with, among other things, feeding cattle with green clover ryegrass, his large and beautiful Dutch (a cattle herd kept for milk production) which he himself administers, and about the successful experiment with a "piil plant" and with the acacia tree.

In 1804 he bought together with Count Christian Conrad Sophus Danneskiold-Samsøe the Egholm castle and Krabbesholm estate for 284,000 Rd.

The two companions divided two years later the estates, so that Count Christian Conrad Sophus Danneskiold Samsøe took over Krabbesholm, while Lars Larsen acquired Egholm for 189,333 Rd.