Elof Holstenius (also spelled Elaus, Elavus, Olaus; 2 October 1677, in Västerås – 18 July 1736, in Husby) was a Swedish professor of theoretical philosophy and later, from 1709 to 1710, the rector of the Academia Gustavo-Carolina in Pärnu. He studied at Uppsala University. He would be the last rector of the Academia Gustavo-Carolina at large, with Georg Friedrich Parrot becoming the succeeding rector of the university, renamed the Kaiserliche Universität zu Dorpat, in 1802, nearly a century after the term of Holstenius.[1]