Inessa Armand (May 8, 1874 – September 24, 1920), born Inès Stéphane, was a French communist politician and feminist who spent most of her life in Russia. She was also known for her alleged affair with Vladimir Lenin.

She was born in Paris as the daughter of Théodore Stéphane, a French opera singer, and Nathalie Wild, a British comedian. Her father died when she was only five and she was brought up by an aunt living in Moscow.

At the age of nineteen she married Alexander Armand, the son of a wealthy Russian textile manufacturer. Together they opened a school for peasant children. She also joined a charitable group helping destitute women in Moscow.

In 1903 she joined the illegal Social Democratic Labour Party. Armand distributed illegal propaganda and after being arrested in June 1907, she was sentenced to two years' internal exile in Mezen in Northern Russia.

In November 1908 Armand managed to escape from Mezen and eventually left Russia to settle in Paris where she met Vladimir Lenin and other Bolsheviks living in foreign exile. In 1911 Armand became secretary for the Committee of Foreign Organisations established to coordinate all Bolshevik groups in Western Europe.

Armand returned to Russia in July 1912, to help organise the Bolshevik campaign to get its supporters elected to the Duma. Two months later she was arrested and imprisoned, only to be released against bail in March 1913. Once again illegally leaving Russia, she went to live with Vladimir Lenin and Nadezhda Krupskaya in Galicia. She also began work editing Rabotnitsa.

Armand was upset that many socialists in Europe chose not to fight against the war effort during World War I. She joined Lenin in helping to distribute propaganda that urged Allied troops to turn their rifles against their officers and start a socialist revolution. In March 1915, Armand went to Switzerland where she organised the anti-war International Conference of Socialist Women.

On 1 March 1917, Tsar Nicholas II abdicated, leaving the Provisional Government in control of the country. The Bolsheviks in exile were now desperate to return to Russia to help shape the future of the country. The German Foreign Ministry, who hoped that their presence in Russia would help bring the war on the Eastern Front to an end, provided a special train for Armand, Vladimir Lenin and 26 other revolutionaries to travel to Petrograd.

After the October Revolution Armand served as an executive member of the Moscow Soviet. Armand was a staunch critic of the Soviet government's decision to sign the Treaty of Brest-Litovsk. On her return to Petrograd, she became director ofZhenotdel, an organisation that fought for female equality in the Communist Party and the Soviet trade unions, lasting till 1930, apparently. She also chaired the First International Conference of Communist Women in 1920. The spring of 1920 saw the appearance, again on Armand’s initiative, of the journal Kommunistka, which dealt with "the broader aspects of female emancipation and the need to alter the relationship between the sexes if lasting change was to be effected".

But the fifth number of this journal carried its founder’s obituary. While she was on a holiday in the Caucasus, she contracted cholera and died at the age of forty-six. She was buried in the Kremlin Wall Necropolis in Moscow.

Armand has been portrayed in the movies Lenin in Paris (1981, played by Claude Jade), Le Train (1987, played by Dominique Sanda) and All My Lenins (1997, played by Janne Sevchenko). She was also portrayed as the heroine in the fictionalised account of Lenin's Russian return Seven Days to Petrograd (1988 by Tom Hyman, Penguin Books).