Gustav Landauer (; 7 April 1870 – 2 May 1919) was a German anarchist writer and revolutionary. As one of the leading theorists of anarchism in Germany at the turn of the 20th century, he advocated a form of libertarian socialism that rejected both capitalism and Marxist historical materialism. Landauer's philosophy synthesized anarchism with romanticism, mysticism, and a non-racist, communitarian interpretation of völkisch thought, emphasizing spiritual renewal and the creation of decentralized, autonomous communities.

Born into a middle-class Jewish family in Karlsruhe, Landauer's early thought was shaped by German Romanticism and the philosophies of Baruch Spinoza, Arthur Schopenhauer, and Friedrich Nietzsche. In Berlin during the 1890s, he became a prominent anarchist voice, breaking with the Social Democratic Party over its rigid Marxism. He argued that socialism was not an inevitable outcome of economic laws but an act of human will and ethical choice. His major works, including Skepsis und Mystik (Skepticism and Mysticism, 1903) and Aufruf zum Sozialismus (Call to Socialism, 1911), articulated his view that the state is not an institution to be violently overthrown but a social relationship that can be replaced by creating new, voluntary forms of community.

From the 1890s until the First World War, Landauer was the central figure behind the newspaper Der Sozialist. In 1908, he founded the Socialist Bund (Socialist League), an association of autonomous groups intended to prefigure a future libertarian society through cooperative settlements. A committed pacifist, Landauer opposed World War I and advocated for a general strike to prevent it. During this time, he developed a cosmopolitan cultural nationalism that defined nations as peaceful communities of spirit, distinct from the violent structures of states.

During the German Revolution of 1918–1919, Landauer was invited to Munich by Kurt Eisner. He participated in the proclamation of the Bavarian Soviet Republic in April 1919 and served in its first, short-lived council of people's deputies as Commissioner for Enlightenment and Public Instruction. When the republic was crushed by government troops, Landauer was arrested and murdered in Stadelheim Prison. His ideas influenced figures such as Martin Buber, Ernst Toller, and the German youth movement, and his work represents a significant communitarian and anti-authoritarian alternative to both capitalism and state socialism.

Early life and education (1870–1891) Gustav Landauer was born in Karlsruhe, the capital of Baden, on 7 April 1870, into a well-to-do middle-class Jewish family. His parents, Hermann and Rosa (née Neuberger) Landauer, were assimilated Jews who were not religious, and Landauer's contact with the synagogue was slight.

His father, a shoe store owner, intended for him to have a commercial career and sent him to a Realgymnasium. However, Landauer showed an unusual sensitivity to music and literature from an early age and eventually switched to the classically oriented Bismarck Gymnasium. He found the formal classical instruction "boring and stultifying", gaining his "real education" from the theatre, books, and music. At fifteen, he was deeply attached to German romantic music and literature, particularly the works of Richard Wagner. He later explored the philosophies of Baruch Spinoza and Arthur Schopenhauer, whose The World as Will and Representation appealed to his romantic and mystical inclinations. At seventeen, during a school patriotic festival, Landauer delivered a "mildly revolutionary speech" that drew heavily on the then-academically unacceptable poet Heinrich Heine, for which he was publicly reprimanded by the school's director.

Between 1888 and 1891, Landauer studied Germanics, philosophy, and history at the University of Heidelberg, the University of Berlin, and the University of Strasbourg. He became proficient in French and English and developed a deep interest in the writers of the German Romantic period. His studies were also shaped by the works of Henrik Ibsen and Friedrich Nietzsche. Ibsen's dramas, particularly An Enemy of the People and Ghosts, appealed to Landauer for their depiction of the creative individual struggling against a philistine bourgeois society. Nietzsche's philosophy, which Landauer studied intensively, provided a crucial bridge from his earlier passive aestheticism to later activism. Nietzsche's emphasis on life affirmation, the "will to power" (interpreted by Landauer as voluntarism and self-transformation), and the critique of Schopenhauer's pessimism deeply resonated with him.

Socialist and anarchist beginnings in Berlin (1891–1893)

In 1891, Landauer returned to Berlin, intending to continue his studies. The German capital was a center of political and intellectual ferment following the 1890 resignation of Chancellor Otto von Bismarck and the lapse of the Anti-Socialist Laws. The Social Democratic Party (SPD) had adopted a new, more strictly Marxist program at its 1891 Erfurt conference, an act which drove many intellectuals, including Landauer, away from the party. Some, influenced by Nietzsche and Max Stirner, turned towards anarchism. Through the drama critic and novelist Fritz Mauthner, Landauer was introduced to the progressive literary figures of the city and became involved with the Neue Freie Volksbühne, a theatre organization for the working class that had split from the more Marxist Freie Volksbühne.

Landauer's intellectual background and his association with a radical anti-Marxist socialist group led by Benedikt Friedländer made him receptive to revolutionary currents. He began writing articles on social questions, some of which were published in the SPD organ . Soon after February 1892, he joined the staff of , a newspaper founded by dissident socialists who had been expelled from the SPD. The paper eventually adopted the subtitle "Organ of Anarchism-Socialism" and became the leading voice for anarchism in Germany. In late 1891 or early 1892, Landauer married a seamstress, Grete Leuschner.

During this period, Landauer wrote his first book, (The Preacher of Death), published in 1893. The work, which Landauer later described as the product of a twenty-year-old, is a philosophical novel dedicated to the cause of anarchism. It follows a hero who, through a process of overcoming despair rooted in pure rationalism, finds a path back to socialist activism through sensual love and an appreciation for life. The book contains the essential elements of Landauer's mature vision of a better life for mankind. In August 1893, Landauer was selected as an anarchist delegate to the International Workers' Congress in Zurich. After much angry debate, a motion by SPD leader August Bebel excluded all anarchists. Landauer and other German delegates were ejected from the congress by force. At a separate meeting of anarchists, he delivered a fiery speech calling for the general strike to be the "introduction of the revolution".

Anarcho-socialism, romanticism, and mysticism (1893–1907) In the mid-1890s, Landauer began to frame his anarcho-socialism in terms of romantic and idealist philosophy, shifting away from purely urban, proletarian concerns towards ideology, handicrafts, and peasant life. This reorientation developed as an alternative to Marxist materialism and industrial urbanism.

The appeal of anarchism and early activism

Anarchism in Germany was a relatively weak tradition, but under Landauer became the country's only anarchist newspaper. Its appeal was mainly to intellectuals and artists rebelling against regimentation. Landauer's initial phase of anarchism (1893–1894) focused on anarcho-syndicalism, advocating for workers to build trade unions as models for a future socialist society. In October 1893, he was arrested for an article in advocating "disobedience of the law" and sentenced to two months in prison. In December, an additional nine months were added for "incitement". While imprisoned, he wrote the novella "Arnold Himmelheber".

After his release, with temporarily suppressed, Landauer faced financial hardship. The University of Freiburg rejected his application to study medicine due to his prison record. In 1895, he re-established and published the pamphlet (A Way to the Liberation of the Working Class), which outlined his new tactic: establishing producer-consumer cooperatives to build socialism outside the capitalist system. He increasingly clashed with authorities, leading to a notable incident in October 1896 where he and his colleagues exposed a police spy, Commissar Bösel. Landauer was arrested but ultimately acquitted. At the 1896 London International Socialist Congress, from which anarchists were again excluded, Landauer argued for peasant cooperatives to prevent proletarianization, marking a turn toward an anti-industrial, romanticism.

Isolation and mysticism

In 1897, Landauer separated from his wife Grete and moved to Friedrichshagen, a literary colony. Political isolation followed as lost readers and ceased publication in 1899. He was imprisoned again for six months in March 1899 for libeling a police commissioner in connection with the Ziethen affair, a case he had taken up with the social reformer Moritz von Egidy. Shortly before his imprisonment, in March 1899, he met the poet Hedwig Lachmann at a meeting of the Neue Gemeinschaft, a literary circle led by Heinrich and Julius Hart. Their relationship deepened through correspondence while he was in prison, and she became his second wife in 1903.

This period of isolation led Landauer to mysticism. While in prison (1899–1900), he translated the sermons of the medieval German mystic Meister Eckhart and edited the manuscripts for his friend Fritz Mauthner's seminal work on language critique, . These two influences formed the basis for his own major philosophical work, (Skepticism and Mysticism: Essays in Connection with Mauthner's Language Criticism, 1903).

In , Landauer utilized Mauthner's critique of language—which argues that language is incapable of perceiving reality—but moved beyond Mauthner's skepticism. Landauer contended that once skepticism has cleared away old illusions, new, self-created "illusions" (mysticism) are necessary for life. He posited that true reality is a "World-I" or universal psyche, a community with the world that is experienced internally. This mystical consciousness of the indwelling universe () is an awareness of the individual's rootedness in inherited, developing communities (, humanity).

After his release, Landauer and Lachmann lived in England from September 1901 to June 1902, where they associated with Peter Kropotkin. Financial difficulties and Lachmann's pregnancy led them to return to Germany, settling in Hermsdorf, near Berlin. In 1903, he secured a divorce from his first wife and formally married Lachmann. That same year, a second edition of was published, along with a volume containing his two novellas, "Arnold Himmelheber" and "Lebendig tot" (written in prison in 1900), under the title (Might and Destinies).

The romantic as socialist (1907–1918) In the decade before the Bavarian Revolution, Landauer articulated his mature synthesis of romantic and socialist thought, producing his most substantial works.

Philosophy of history and the Socialist Bund

Landauer's major historical work, (1907), presented a romantic medievalist view, portraying the Middle Ages as an age of (spirit) and organic community, a "society of societies" destroyed by the modern emphasis on the state beginning around 1500. The spirit of community (), however, survived as a subterranean countercurrent.