S.O.S. Montfort was a Franco-Ontarian movement that fought to save Montfort Hospital, the only primarily francophone hospital in Ontario, after the Mike Harris government announced it would be shutting down the hospital in 1997. One of the largest mass movements in Franco-Ontarian history, the level of mobilisation it saw and the ultimate success of the campaign has been noted as a significant moment in the struggle for French-language rights in Ontario and in the wider Canada.