Arne Geijer (born 7 May 1910, in Söderala, Söderhamn Municipality, Hälsingland, died 27 January 1979 in Bromma, Stockholm) was a Swedish trade union organizer.
Geijer left school when he was thirteen and began working in agriculture. He later completed an apprenticeship as a toolmaker, and joined the Swedish Metalworkers' Union. At the age of 28 he began working full-time for the union as its director of education, and in 1945 he won election as its general secretary, also taking up a position of the council of the International Metalworkers' Federation.[1]