Blaise Castle is an 18th century mansion house and estate near Henbury in Bristol (formerly in Gloucestershire), England. Blaise Castle was immortalised by being described as "the finest place in England" in Jane Austen's novel Northanger Abbey (a sentiment not necessarily shared by the author, however).
After the Anglo-Saxon invasion and subsequent conversion to Christianity, the land was granted to the Bishop of Worcester as part of the Kingdom of Mercia. During this time the estate picked up its association with Saint Blaise that lives on in the estate's name.
A branch of the Bristol City Museum and Art Gallery since 1949, Blaise Castle House now features collections relating to numerous household items in addition to its period interior decoration.
The grounds were laid out by Humphry Repton (1752–1818) a leading landscape gardener. Parts of Repton's designs still exist, notably the impressive carriage drive which winds its way from the house. The Regency architect John Nash was responsible for the addition of the conservatory.
The grounds, which are open free of charge to the public, include a gorge cut by the Hazel Brook through Bristol's limestone. The gorge features a selection of stunning landscape, including Goram's Chair, a limestone outcrop often used by climbers, and Lover's Leap, a panoramic viewing spot. Stratford Mill was re-erected within the gorge after Chew Valley Lake was flooded to form a reservoir. Ongoing renovations started in 2004 of the mill, settling ponds and associated estate pathways. At the gorge's southern end, Hazel Brook joins the River Trym, which continues its flow towards Sea Mills.