Strasserism (Strasserismus) is a strand of National Socialism associated with the brothers Otto and Gregor Strasser, purged from the NSDAP in 1934 after an attempted coup by their Black Front faction (Combat League of Revolutionary National Socialists, Kampfg​emeinschaft Revolutionarer Nationalsozialisten).

Representing the left-wing of the NSDAP, Strasserism stresses the 'Socialist' aspect of National Socialism.

The Night of the Long Knives that took place in Germany in the Summer of 1934 in response to the attempted coup d'etat of Ernst Rohm eliminated the main Strasserite faction. Other movements described as Strasserite include:

  • The Himmler-Putsch of July 1944: in which elements of the SS planned to remove Hitler and make peace with Stalin's USSR. The fact that the SS faction involved favoured peace with the Communist USSR and immediate war with the Capitalist USA has led to its description as a Strasserite Putsch. Organised by Heinrich Himmler and his subordinate and former enemy Emil Maurice (it was also known as the Mischlinge-Putsch before Himmler's involvement was revealed), it was put down, primarily due to the efforts of General Friedrich Fromm and the chief of the Criminal Police Arthur Nebe.
  • The Southern Cone Plot of 1954: a multinational coup attempt by left-wing factions in the governments of Argentina, Brazil and Bolivia. The factions implicated in the coup were widely described as Strasserite. Once in power, the new regimes would have formed a political union between the three countries and planned to annex Paraguay, Uruguay and possibly Chile.
  • The Hungarian Rebellion of February 1957: ostensibly led by a Strasserite faction of the ruling Arrow Cross Party in the south of the country. Crushed by Italian intervention.