Ferdinand Johann Wiedemann

Ferdinand Johann Wiedemann (30 March 1805 in Hapsal (now Haapsalu) – 29 December 1887 in Saint Petersburg) was an Governorate of Estonia linguist who researched Uralic languages, mostly Estonian. Wiedemann was also a botanist.

Wiedemann was of German-Swedish origin. In 1869 he published an Estonian-German dictionary (Ehstnisch-deutsches Wörterbuch), which was the richest dictionary of Estonian words for a long time.