| Viktor von Lang | |
| Birth Date: | 2 March 1838 |
| Birth Place: | Vienna, Austrian Empire |
| Death Place: | Vienna, Austria |
| Field: | Theoretical chemistry |
| Work Institution: | University of Vienna |
| Alma Mater: | University of Gießen |
| Academic Advisors: | Andreas von Ettingshausen |
| Doctoral Students: | Franz S. Exner |
Viktor von Lang (2 March 1838 – 3 July 1921) was an Austrian chemist. He is counted among the pioneers and founders of crystal physics.
Lang earned his doctorate from the University of Giessen in 1859 with a thesis titled "Physikalische Verhältnisse kristallisierter Körper".
From 1865 to 1909, Lang served as director of the Physikalisches Kabinett in Vienna.[1] His book on introductory theoretical physics, Einleitung in die theoretische physik, was published in eight editions from 1867 to 1891. With crystallographer Wilhelm Josef Grailich, he was co-author of Untersuchungen über die Physikalischen Verhältnisse Krystallisirter Körper ("Investigations into the physical conditions of crystallized bodies").[2]
The mineral langite was named in his honor by Nevil Story Maskelyne.[3]