The following events related to sociology occurred in the 1840s.

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• Pierre-Joseph Proudhon's What is Property? is published.

• Auguste Comte published Volume 5 of The Course of Positive Philosophy: La Partie Historique De La Philosophie Sociale^[1]

• Auguste Comte publishes Volume 6 of The Course in Positive Philosophy: Le Complément De La Philosophie Sociale Et Les Conclusions Générales,^[2] completing the series.
• Auguste Comte's Sociologie Comme Instruction Affirmative is published
• Auguste Comte's Social Statics and Social Dynamics is published

• Søren Kierkegaard's Either/Or is published in two volumes.^[3]
• John Stuart Mill's A System of Logic, Ratiocinative and Inductive is published in two volumes.^[4][5]

• Friedrich Engels' Outline of A Critique of Political Economy is published
• Engels and Marx's The Holy Family is published
• Karl Marx's Economic and Philosophic Manuscripts are written.^
• Max Stirner's The Ego and Its Own is published in German.

• Friedrich Engels' Conditions of the Working Class in England (original German edition) is published

• Marx and Engels' The German Ideology is written.^
• Pierre Joseph Proudhon's The System of Economic Contradictions or the Philosophy of Poverty is published
• Søren Kierkegaard's Two Ages: A Literary Review is published

• Friedrich Engels' The Principles of Communism is written during October–November
• Karl Marx's The Poverty of Philosophy is published, a critique of Proudhon's 1846 work.

• Engels and Marx's The Communist Manifesto is published
• Study group on the social question held attended by Frederic Le Play, Jean Reynaud, Lamartine, François Arago, Carnot, Lanjuinais, Tocqueville, Montalembert, Sainte-Beuve, Agénor de Gasparin, Abbé Dupanloup, Adolphe Thiers, Auguste Cochin, Charles Dupin and others

• Søren Kierkegaard's The Sickness Unto Death is published.