Juho Kaarle Jännes (until 1906 Genetz), (28 July 1880 Hämeenlinna - 26 January 1964 Helsinki) was a Finnish agricultural politician who served as the first chairman of the Finnish Agricultural Producers' Union from 1917 to 1918 and 1923 to 1955. The parents of Jännes were professor and senator Arvid Genetz and Julia Arppe. Genetz, fennoman used pen name Arvid Jännes and his children translated their last name to Jännes. Juho Jännes undergraduate from the Helsinki Finnish School in 1898 and studied physics and chemistry at the University of Helsinki.