Lars Magnussen Slagsvold (24 April 1887 – 2 September 1959) was a Norwegian veterinarian.
He was born in Romedal as a son of farmer Magnus Slagsvold (1854–1921) and Inger Krogstie (1855–1924).[1] He finished his education in 1909 in Copenhagen. After several years of practice he was hired as a head of department in the National Veterinary Institute in 1924. He was a professor at the Norwegian School of Veterinary Science from 1936 to 1946, and from 1946 to 1957 he headed the State Animal Authority.[2]
Slagsvold was also noted for his work to eliminate the diseases bovine tuberculosis and brucellosis, together with Niels Thorshaug and Halfdan Holth.[2] Slagsvold was decorated as a Knight, 1st Class of the Order of St. Olav in 1951 and he was also held the Order of the Dannebrog (Commander) and the Order of the White Rose of Finland.[1]