Ivan Dejmal (October 17, 1946 in Ústí nad Labem[1] – February 6, 2008 in Prague[2][3]) was a Czech politician and environmentalist.

He spent four years in prison on charges of "subversive activity against the Republic" (1970–1972 and 1974–1976).

He became a signatory to Charter 77 early in 1977 and soon became the head of its environmental commission, despite limited education in ecology.

In December 1989, Dejmal participated in the foundation of the Confederation of Political Prisoners.

[5] Dejmal was supporter of several environmental NGOs - an active member of Společnost pro trvale udržitelný život (Society for Sustainable Living),[6] a member of Honorary board of Děti Země (Children of the Earth),[7] etc.