Sveinn Thorvaldson (March 3, 1872[1] – July 14, 1949[2]) was a politician in Manitoba, Canada.

He served in the Legislative Assembly of Manitoba from 1914 to 1915, as a member of the Conservative Party.

[3] He worked as a merchant and was secretary-treasurer of Sigurdson and Thorvaldson Company Ltd. Thorvaldson served as reeve for the Rural Municipality of Gimli from 1903 to 1905 and for the Rural Municipality of Bifrost from 1908 to 1914, from 1922 to 1926 and from 1929 to 1930.

He was elected to the Manitoba legislature in the 1914 provincial election,[1] defeating Liberal candidate Einar Jonasson and Independent-Liberal Taras Ferley in the constituency of Gimli.

In 1915, the Roblin administration was forced to resign from office amid a serious corruption scandal.