The Kanneworff House (Danish: Kanneworffs Hus), situated at the acute-angled corner of Bredgade and Store Strandstræde, next to Nyhavn, is the smallest and oldest building on Kongens Nytorv in central Copenhagen, Denmark.

It takes its name after Lars Kanneworff, a retailer of gentlemen's clothing who bought it in 1836, in the hands of whose family it remained for almost a hundred years.

[1] The present building on the site was constructed with two storeys in the 17th century, prior to the creation both of Kongens Nytorv and Nyhavn.

Collin's property consisted of two two-storey buildings, one towards both streets, attached to each other by a cross wing.

[3] Prom undertook an adaptation of the building in the 1780s, adding an extra floor as well as a Mansard roof.

Kirstine Prom (née Olivarius) resided in the building with her four youngest children and one maid at the 1801 census.

His eldest daughter, Julie Albertha Nathalia Kannewortt(1821-1886), was shortly thereafter (21 September) married to Carl Friderich Glad (1803-1862), a ship captain.

The daughter and son-in-law Julie and Charel Friderich Glad resided on the second floor with the lodger Heinrich Peter Jacob Holm (ship captain).Laurits Hultmann, a sailor and shopkeeper, resided in the basement.

Lars Kannewarth resided in the building with four of his children, one Madame Brauensteinm her son Carl Brauenstein, 12-year-old Louise Wessel, a maid and a seemstress.

Gustaw Georg Dalin, a shoemaker, resided in the building with his wife Anna Magrete Didrichsen, tneir three-year-old daughter and musician at the 1st Infantry Brigade Julius Braunstein, Niels Larsen, a barkeeper, resided in the basement with his wife Karen Kjerstine Kaasm their two children (aged one and three) and one maid.

Thorvald Kanneworff's sister Otilia (1836–1904) was married to the businessman (grosserer) Anthon Valdemar Smidt.

In 1880, when she had already become a widow, she lived on the ground floor of Lille Strandstræde 18 with her five children and her elder sister Ida Kanneworff (1722-1905).

[11] Another daughter, Eugenia Dorothea Nathalia Kanneworff, was married to the lawyer and bank Hans Cornelius Ritzau, with whom she lived in Køge.