Otto Moritz (I) Ludwig von Engelhardt (December 9 [O.S. November 27] 1778 - February 10 [O.S. January 29] 1842) was a Baltic German mineralogist. He was a member of the Engelhardt family.
Otto Moritz Ludwig von Engelhardt (russisch Мориц Федорович фон Энгельгардт; * 27. Novemberjul. / 8. Dezember 1778greg. in Gut Wieso/Estland; † 29. Januarjul. / 10. Februar 1842greg. in Dorpat) war ein deutsch-baltischer Mineraloge und Geologe. (de)
Otto Moritz (I) Ludwig von Engelhardt (December 9 [O.S. November 27] 1778 - February 10 [O.S. January 29] 1842) was a Baltic German mineralogist. He was a member of the Engelhardt family. (en)
Мориц Фёдорович фон Энгельгардт (нем. Otto Moritz Ludwig von Engelhardt; 1778—1842) — профессор минералогии и геологии Дерптского университета. (ru)