Lars Samuel Myhrer Evensen (12 November 1896 – 19 January 1969) was a Norwegian trade unionist and politician. He belonged to the Communist Party in the 1920s, but later joined the Labour Party. He was also deputy chairman of the Norwegian Confederation of Trade Unions. After the Second World War he served for many years as Minister of Industry.
Evensen was born in Drøbak as the son of smithmaster Samuel Anton Evensen (1858-1943) and his wife Laura Myhrer (1864-1931). He worked as a sausage maker from 1914 to 1924, and became involved in his corresponding trade union from 1920.
He also entered local politics, as a member of Lørenskog municipal council from 1922 to 1928. He became a high-ranked member of the Communist Party, which was formed in 1923 by a split from the Labour Party. He served as party secretary from 1925 to 1927, and from 1925 to 1928 he was a member of its central committee. He chaired the regional chapter in Oslo and Akershus from 1926 to 1927.
From 1925 he was also a member of the council (representantskap) of the Confederation of Trade Unions. From 1927 to 1934 he chaired his trade union Norges kjøttindustriarbeiderforbund. He was among the founders of the sports club Kjøttindustriens IL in 1930 and the temperance group Kjøttindustriens avholdslag in 1932.
Evensen eventually joined the Labour Party, and was a board member of the local party chapter in Oslo in 1932. At the same time he rose in the hierarchy of the Confederation of Trade Unions to become secretary from 1934 to 1939, and deputy chairman from 1939 to 1945—from 1940 in exile. From 1940 to 1945, during the German occupation of Norway, Evensen was a member of the Norwegian resistance movement (Hjemmefronten) and worked at the . He also chaired the Stockholm-based secretariat of the Confederation of Trade Unions from 1941 to 1945. After the occupation he was selected as Minister of Trade in 1945 during the first cabinet Gerhardsen. He continued in the position after the free general election of 1945, serving as a member of the second cabinet Gerhardsen and the cabinet Torp from 1945 to May 1953 and September 1953 to November 1953. The position was renamed Minister of Industry in 1947. For some months in 1951 Arne Drogseth was acting Minister of Industry, and Erik Brofoss filled the position from May to September 1953.