Baron Peter von Uslar (Russian: Петр Карлович Услар) (September 1 [O.S. August 20] 1816 –(July 20 [O.S. July 8] 1875) was a Russian general, engineer and linguist of German descent, known for his research of languages and ethnography of peoples of Caucasus.
Peter von Uslar was born in Kurovo manor in Tver Governorate, Russian Empire. Peter von Uslar after as graduated from the Chief Engineering School, he graduated from the General Staff Academy and did not have formal education in linguistics.
In 1850 he was appointed member of the Caucasus Department of the Russian Geographical Society and ordered to compile the history of Caucasus. This appointment had eventually led to his interest in researching of Caucasian languages and to his tremendous contribution into the recording of numerous Caucasian languages from variuous linguistical groups, such as Abkhaz, Ubykh, Svan, Chechen, Avar, Lak, Tabasaran, Lezgian, Dargin, etc.