Holdenby House is a historic country house in Northamptonshire, traditionally pronounced, and sometimes spelt, Holmby. The house is situated in the parish of Holdenby, six miles (10 km) northwest of Northampton and close to Althorp. It is a Grade II* listed building.

Prodigy houses are large and showy English country houses built by courtiers and other wealthy families, either "noble palaces of an awesome scale" or "proud, ambitious heaps" according to taste. The prodigy houses stretch over the periods of Tudor, Elizabethan, and Jacobean architecture, though the term may be restricted to a core period of roughly 1570 to 1620. Many of the grandest were built with a view to housing Elizabeth I and her large retinue as they made their annual royal progress around her realm. Many are therefore close to major roads, often in the English Midlands.