Template:Infobox medical intervention Macewen's operation is an operation for the cure of inguinal hernia,<ref name="Ferguson1907">Template:Cite book</ref><ref name="Society1888">Template:Cite book</ref> developed by Scottish surgeon Sir William Macewen (1864-1924).
It is performed by closing the internal ring with a pad made of the hernial sac.<ref name="Allingham1904">Template:Cite book</ref>