Undercliff State Hospital was a roughly 40-acre (16 ha) hospital situated on Undercliff Road, Meriden, Connecticut. It operated from 1910 to 1976. The hospital was first built under the name Meriden Sanatorium to serve children with tuberculosis, German measles, chickenpox, and smallpox, but began to accept adult patients in 1939. In the early 1920s, the site name was changed to Undercliff Sanatorium. In 1967, it was changed once again to Undercliff Mental Health Center.