I

Idea	Idealism
Idealist conception of History	Identity Politics
Identity, the Law of	Ideology
Ideology (Althusser)	Il-sung, Kim (1912-1994)
Illusory Being [or Semblance]	Ilyenkov, Evald Vasilyevich (1924-1979)
Immediate knowledge	Imperialism
Impossibilism	In and For Itself
In Defense of Bolshevism (1937-1941)	In Itself
Inber, Vera (1890-1972)	Independent Labour Party
Independent Social Democratic Party of Germany	Indian National Congress
Individual	Individualism and Collectivism
Induction	Industrial Organizer (1941-1942)
Industrial Union Bulletin / Industrial Worker (1907 - 1913)	Industrial Workers of the World
Inflation	Inkpin, Albert (1884-1944)
Instrumental Reason and Communicative Reason	Instruments of Labour
Intellectual Property	Inter-District Organisation of United Social-Democrats
International and the War	International Council Correspondence Living Marxism (1934-1943)
International Left Opposition	International News (1935/1950)
International Socialism (1958-1978)	International Socialism (London 1958-1978)
International Socialist Bureau (I.S.B.)	International Socialist Review, The (all three publications with the same name)
International Women's Day (March 8)	International Working Mens Association
Internationale group	Internationalism
Internationalist, The (1997-present)	Intuition
Intuitionism	Invisible Hand
Iron Curtain	Iskra (Spark)
Italian Socialist Party	Izvestia (News)
Izvestia Soveta Rabochikh Deputatov (Bulletin of the Soviet of Workers' Deputies)	Izvestia Vserossiiskogo Soveta Krestyanskikh (News of the All-Russia Soviet of Peasants' Deputies)