Count Friedrich Carl Eugen Vsemir von Berchtold, baron von Ungarschitz (Czech: Bedřich Karel Eugen Všemír Berchtold hrabě z Uherčic; 25 October 1781 – 3 April 1876), was a German-speaking Bohemian physician and botanist of Austrian descent.

Berchtold was born in Stráž nad Nežárkou (German: Platz an der Naser) (now Jindřichův Hradec District), in the Austrian Empire.

He graduated from medical school in 1804, after which he practiced medicine and devoted much of his time to botany and natural history.

He eventually abandoned regular medical practice and travelled throughout Europe, the Middle East and Brazil.

He died in 1876 in Buchlau (now Buchlovice), Moravia (now part of the Czech Republic).