Björnsnäs, Manor house in Trosa, Sweden.

Björnsnäs is a manor house at the innermost part of Bråviken in Åby, Kvillinge parish, Östergötland. The main building was erected in 1848 in the late Empire style and modernised in 1898 under architect Isak Gustaf Clason.

Björnsnäs belonged to the Crusebjörn family in the 17th century and was reduced to the crown in 1683. It then passed through the Reenstierna, Staël von Holstein, von Friesendorff and Trozelli families. The present manor house was built in 1848 in the late Empire style and modernised in 1898 under architect Isak Gustaf Clason.

The estate's name comes from the Crusebjörn family, who owned it in the 17th century; it was reduced to the crown in 1683. Later owners included the Reenstierna, Staël von Holstein, von Friesendorff and Trozelli families. The manor stands near the innermost part of Bråviken in Åby, Kvillinge parish, Östergötland.

Björnsnäs stands by the innermost part of Bråviken at Åby in Kvillinge parish, Östergötland, east of Norrköping. The estate covered 743 hectares in 1920, of which 222 hectares were arable land, so the surroundings are open farmland and water rather than a formal visitor park. Approach from the Åby side and treat the manor as private property.

The estate was reduced in 1683, when the Crown reclaimed it from the Crusebjörn family. In 1920 it covered 7½ mantal, 743 hectares of which 222 were arable, assessed at 384,800 kronor. The 1848 main building was modernised in 1898 under architect Isak Gustaf Clason.