A helmet for anesthesia, adapted to keep confined anesthetic gases and to administer them in a non-invasive fashion to a patient laying on an operating table, allowing to provide oxygen and/or anesthetic gases through tubes and fast access to the patients head in case of emergency is described. The helmet has a lower half-shell and an upper half-shell, the lower half-shell being anatomically shaped to receive and support the nape and the neck of the laying patient, the upper half-shell and the lower half-shell having fastening means for fastening one to the other and being configured to be fitted one to the other and to the neck or torso of the patient to form a substantially airtight enclosure for enclosing head of the patient, at least one inlet port for gas supply and at least one outlet port for gas evacuation being on the lower half-shell and/or the upper half-shell.
