Opening Night is a detective novel by Ngaio Marsh; it is the sixteenth novel to feature Roderick Alleyn, and was first published in 1951. It was published in the United States as Night at the Vulcan. The novel is one of the theatrical ones for which Marsh was best known, and concerns the murder of an actor backstage on opening night of a new play in London. The play is being performed at the Vulcan Theatre; it was formerly known as the Jupiter Theatre, renamed after an infamous murder recounted in the Alleyn short story "I Can Find My Way Out". The old crime is referenced in the text.