The Osvald Group is responsible for the first, active event of anti-Nazi resistance in Norway, to protest the inauguration of Vidkun Quisling.

The Osvald Group was a Norwegian organisation that was the most active World War II resistance group in Norway from 1941 to the summer of 1944. Numbering more than 200 members, it committed at least 110 acts of sabotage against Nazi occupying forces and the collaborationist government of Vidkun Quisling. The organisation is perhaps best known for conducting the first act of resistance against the German occupation of Norway, when on 2 February 1942, it detonated a bomb at Oslo East Station in protest against Quisling's inauguration as Minister-President.

A resistance movement is an organized group of people that tries to resist or try to overthrow a government or an occupying power, causing disruption and unrest in civil order and stability. Such a movement may seek to achieve its goals through either the use of violent or nonviolent resistance, or the use of force, whether armed or unarmed. In many cases, as for example in the United States during the American Revolution, or in Norway in the Second World War, a resistance movement may employ both violent and non-violent methods, usually operating under different organizations and acting in different phases or geographical areas within a country.

In government and politics, inauguration is the process of swearing a person into office and thus making that person the incumbent. Such an inauguration commonly occurs through a formal ceremony or special event, which may also include an inaugural address by the new official.

Vidkun Abraham Lauritz Jonssøn Quisling was a Norwegian military officer, politician and Nazi collaborator who headed the government of Norway during the country's occupation by Nazi Germany during World War II.