Sven Olov Knutsson Lindholm (8 February 1903 – 26 April 1998) was a SwedishNazi leader, active in different Swedish fascist organizations from the 1920s to the 1950s.
Born in Jönköping Municipality, Lindholm joined the Swedish army at an early age, rising to the rank of Sergeant. Stationed in Stockholm, he was initially drawn to Elof Eriksson, a proto-fascist who emphasised anti-communism and anti-Semitism. He soon joined Konrad Hallgren in setting up the Sveriges Fascistiska Folkparti (Swedish Fascist People's Party) – which became known as Sveriges Fascistiska Kamporganisation (Swedish Fascist Cause Organization) – serving as organizer and then leader of the group.
The new group, which adopted the swastika, took an anti-capitalist line and organized its own youth group, the Nordisk Ungdom (Nordic Youth). By 1938 Lindholm had become more critical of the government of Germany, and attempted to reorganise the group as a more Swedish version of Nazism, reinventing them as the Svensk Socialistisk Samling (Swedish Socialist Union).
He returned to the army in 1941 as a Fanjunkare in the artillery. He maintained an ambiguous relationship with Germany during war-time, attacking Operation Weserübung, yet also helping to recruit men for Adolf Hitler. Svensk Socialistisk Samling continued to be active until 1950, after which Lindholm went in to semi-retirement, with only minor involvement in far right youth groups maintaining his activity.