Johannes Dieckmann (19 January 1893 – 22 February 1969) was a German journalist and politician who served as the 1st President of the Volkskammer, the parliament of East Germany, from 1949 to 1969.

He studied economics and philosophy at the universities of Berlin, where he joined the Verein Deutscher Studenten (VDSt), a German Studentenverbindung, Giessen, Göttingen and Freiburg.

After the war, he joined the liberal German People's Party (DVP) and became a close associate of Gustav Stresemann in his election campaign.

After the Nazi seizure of power in January 1933, Dieckmann lost his office and worked from October 5, 1933 to August 30, 1939 in fuel and oilshale companies.

A member of the Liberal Democratic Party of Germany, one of several parties in the socialist system of East Germany, Dieckmann was already a founding member of the Society for Studying the Culture of the Soviet Union ("Gesellschaft zum Studium der Kultur der Sowjetunion"; from 1949: Gesellschaft für Deutsch-Sowjetische Freundschaft) in 1947.