Lars Tokstad Sem Platou (2 July 1920 – 30 May 2003) was a Norwegian electrical engineer and politician for the Conservative Party.
He was born in Stavanger as a son of Fridthjof Fredrik Sem Platou (1894–1965) and Johanne Marie Tokstad (1898–1980).
[2] He enrolled as a student at the Norwegian Institute of Technology in 1939, and graduated as civil engineer in electronics in 1946.
He was employed as an electrical engineer in the Hamar-based company Elektrobygg from 1948 to 1975, also maintained a farm in Veldre from 1941 to 1982.
[1] Outside of representative government, Platou was involved in the administration of Vinmonopolet from 1950, finally serving as chair from 1981 to 1987.