Boo gård, Manor house in Nacka Municipality, Sweden.

Boo gård is a two-storey timber manor house with a hipped roof, yellow-painted panelled façades and a main entrance moved from the north side to the south façade facing Baggensfjärden. It was designed in the 1720s by Nicodemus Tessin the Younger, who owned and lived on the estate, and has been a listed building since 1977.

The estate's oldest name was probably Harg or Hargsö, the latter recorded for the surroundings from 1282. In 1700 Nicodemus Tessin the Younger bought Boo; Russian forces burned it in 1719, after which he built the present main building lower on the shore slope. His son, chancellor president Carl Gustaf Tessin, inherited it, and in 1743 Russians again destroyed the park and felled the avenue.

The name Boo comes from the medieval term bo, a management farm within a landed estate, later taken over as the place name. The nearby burial ground and Nacka's only rune stone show the site was in use in the Viking Age. Jakob Bagge, admiral under Erik XIV, owned the estate in the 16th century.

The property is registered as a protected individual building complex, which helps preserve its historical character through conservation guidelines. Access may be limited since this is a private residence with restricted visiting arrangements.

Between 1850 and 1950 a Dutch-type windmill stood on Boo kvarnberg west of the manor, grinding until 1910; it was given to Boo municipality in 1949 and burned down the following year. Boo torn, a viewing tower built in 1996, was modelled on that mill.