One ward has today re-opened at Drumpchapel Hospital.
One ward at Gartnavel General Hospital, one ward at the Victoria Infirmary and one ward at the Western Infirmary are not admitting new patients due to diarrhoea and vomiting.
Seven patients at the Western, two at the Victoria and one at Gartnavel are showing symptoms.
Wards routinely do not admit new patients as a precautionary measure when three or more patients display symptoms of diarrhoea and vomiting.
Dr Syed Ahmed, Consultant in Public Health Medicine, NHS Greater Glasgow, said: "The normal extra infection control precautions have been put in place including limiting staff movement between wards."
"We are continuing to working closely with the Hospitals' Infection Control Teams to monitor the situation."
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