The National Socialist Movement in the Netherlands (Dutch: Nationaal-Socialistische Beweging in Nederland, NSB) was a Dutch fascist and later national socialist political party. As a parliamentary party participating in legislative elections, the NSB had some success during the 1930s. It remained the only legal party in the Netherlands during most of the Second World War.

The NSB was founded in Utrecht in 1931 during a period when several nationalist, fascist and national socialist parties were founded. The founders were Anton Mussert, who became the party's leader, and Cornelis van Geelkerken. The party based its program on Italian fascism and German national socialism, however unlike the latter before 1936 the party was not anti-semitic and even had Jewish members.

In 1933, after a year of building an organization, the party organized its first public meeting, a Landdag in Utrecht which was attended by 600 party militants. Here the party presented itself. After that the party's support began to grow. In the same year the government forbade civil servants to be members of the NSB.

The Netherlands (ⁱ/ˈnɛðərləndz/; Dutch: Nederland [ˈneːdə(r)lɑnt] or [ˈneɪ̯də(r)lɑnt] ( listen); West Frisian: Nederlân; Papiamento: Hulanda) is a constituent country of the Kingdom of the Netherlands, located mainly in North-West Europe and with some islands in the Caribbean. Mainland Netherlands borders the North Sea to the north and west, Belgium to the south, and Germany to the east, and shares maritime borders with Belgium, Germany and the United Kingdom. It is a parliamentary democracy organised as a unitary state. The country capital is Amsterdam and the seat of government is The Hague. The Netherlands in its entirety is often referred to as Holland, although North and South Holland are actually only two of its twelve provinces (a case of pars pro toto; see terminology of "the Netherlands").

National Socialism (common English short form Nazism, German: Nationalsozialismus) was the ideology practiced by the Nazi Party and Nazi Germany. It is a unique variety of fascism that incorporates biological racism and antisemitism. Nazism was founded out of elements of the far-right racist völkisch German nationalist movement and the violent anti-communist Freikorps paramilitary culture that fought against the uprisings of communist revolutionaries in post-World War I Germany. The ideology was developed as a means to draw workers away from communism and into völkisch nationalism. Nazis' paramilitary organization, the Sturmabteilung (SA) engaged in violent attacks upon the movement's opponents, particularly communists, Jews, and social democrats. The Nazis promoted German territorial expansionism to be Lebensraum ("living space") for German settlers.

Nazism advocated the supremacy of the claimed Aryan master race over all other races. It claimed that Jews are the greatest threat to the Aryan race. The Nazis claimed that Jews are a parasitic race that attached itself to various movements and systems to maintain its self-preservation, such as capitalism, the Enlightenment, industrialisation, liberalism, liberal democracy, Marxism, and trade unionism. To. To maintain the purity and strength of the Aryan race, the Nazis sought to exterminate Jews, Romani, and the physically and mentally disabled. Other groups deemed "degenerate" and "asocial" who were not targeted for immediate extermination, but received exclusionary treatment by the Nazi state, included: homosexuals, blacks, Jehovah's Witnesses and political opponents.