Henning Olaussen (born 23 March 1949) was the leader of Nei til EU from 2004 to 2014, an organisation working against Norway becoming a member of the EU.

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He took over the leadership from longtime leader Sigbjørn Gjelsvik at the 2004 congress. He is a former member of the Socialist Left Party.

He is the father of Inga Marte Thorkildsen, member of parliament for the Socialist Left Party.^[1]