St. Otteran's Hospital (Irish: Ospidéal Naomh Otteran) is a psychiatric hospital in Waterford, County Waterford, Ireland.

The hospital, which was designed by Francis Johnston and William Murphy, opened as the Waterford Asylum in 1835.

[1] It is named after local patron Saint Otteran.

After the introduction of deinstitutionalisation in the late 1980s the hospital went into a period of decline.

[2][3] However, despite calls for its closure, some long-stay residents remain in the hospital[4] and the Health Service Executive uses it as a base to provide social inclusion services.