Clare Hall Manor is a former health facility in Blanche Lane, South Mimms, Hertfordshire, England.

[2] The house was built as a private residence in 1745 and became St Monica's Priory, a Roman Catholic nunnery, in 1886.

[3] Following substantial progress towards eradication of smallpox, the hospital converted to the treatment of tuberculosis patients in 1912 and became Clare Hall Sanatorium in 1929.

[3] In 1938, a series of brick huts, operated as part of the Emergency Medical Service, was built on the opposite side of Blanche Lane and were in use throughout the Second World War.

[3] After research services transferred to the Francis Crick Institute in 2015, Clare Hall was advertised for sale.