Johan Afzelius (13 June 1753 in Larv – 20 May 1837 in Uppsala) was a Swedish chemist and notable as the doctoral advisor of one of the founders of modern chemistry, Jöns Jacob Berzelius.

Afzelius received his PhD at Uppsala University in 1776 under Torbern Olof Bergman.

[1] From 1792 to 1797 he undertook research trips to Norway, Denmark and Russia in order to study mineral deposits and to visit scientific institutions.

[1] Afzelius did mineral analyses, and made contributions to the journal Afhandlingar i fysik, kemi och mineralogi (Treatises on physics, chemistry and mineralogy).

In 1801, he was elected a member of the Royal Swedish Academy of Sciences.