Johan Fredrik Wallenius

Johan Fredrik Wallenius (14 August 1765 – 12 January 1836) was a Finnish physician and botanist.

Wallenius was born in Åbo to mathematics professor Martin Johan and Renata Frosterus.

He studied medicine at Stockholm and received a medical license in 1785 under Johan Johansson Haartman (1725–1787).

He wrote a thesis under by Professor Carl Niclas Hellenius on supplementary plant foods for use during years when crops failed in 1782.

He later became a secretary of the Finnish Economy Society from 1800 to 1805 and its chairman from 1812 to 1813.