Lydiard House & Park is a 260-acre country estate at Lydiard Tregoze, which was its formal name, about 3 miles (5 km) west of central Swindon, Wiltshire, near Junction 16 of the M4 motorway.
Since 1955, the park has been open to the public all year round. The park was designated Grade II on the Register of Historic Parks and Gardens in 1987, as an example of a mid-18th century park having archaeological evidence of its 17th-century formal layout. In 2005, Swindon Borough Council received £3m from the Heritage Lottery Fund towards a restoration project which included reinstating a two-acre lake.
The manor house, known as Lydiard House or Lydiard Park, has medieval origins and was remodelled in the 17th century and the 1740s, when the south and east fronts were reworked in Palladian style. The house was designated as Grade I listed in 1955.
Immediately north of the house stands the parish church of St Mary, which is all that remains of the medieval village. The church has 13th-century origins and was refurbished and enlarged in the 15th and 17th centuries; it is Grade I listed.