This thesis is a study of the impersonal construction in Old Icelandic; that is, a study of verbs which have no personal subject. In various Old Icelandic texts, which the author was studying for his Honours course in 1963, the frequency and typicality of impersonal constructions was striking. They even appeared sometimes when the sense, at any rate to an English speaker, seemed to demand a personal subject. They seemed of sufficient individuality and interest to merit a formal study. Since the passive is often an alternative form for the impersonal, it was decided to include it in the study as well.