St. Paul's Walden Bury is a stately home and surrounding gardens located in the village of St Paul's Walden in Hertfordshire. A home of the Bowes-Lyon family, it is best known for its connection to the late Queen Elizabeth, the Queen Mother. One of her childhood homes, it was possibly the site of her birth and was also the location at which she finally accepted Prince Albert's proposal of marriage. It is a Grade II* listed building.
The house was built of red brick with stone dressings and slate roofs in the early 18th century for Edward Gilbert (1680-1762). His daughter Mary married George Bowes of Gibside, Durham, and the estate has been in the possession of the Bowes-Lyon family since 1720.
The gardens are large and set in extensive woodland. They are largely contemporary with the house, although there are more modern features in part by Geoffrey Jellicoe. There are three formal grassed allées radiating in patte d'oie formation. Each allée is flanked by clipped beech hedges.
In 1987 they were designated Grade I on the Register of Parks and Gardens of Special Historic Interest in England.
Coordinates: 51°52′52″N 0°16′34″W / 51.88111°N 0.27611°W