Sigtryggur Jonasson (February 8, 1852 – November 26, 1942) was a community leader and politician in Manitoba, Canada. He played a major part in establishing the Icelandic community in Manitoba. Jonasson served in the Legislative Assembly of Manitoba from 1896 to 1899 and again from 1907 to 1910, as a member of the Manitoba Liberal Party. In 1930, Jonasson represented Canada at the millennium anniversary of Iceland's parliament. The government of Manitoba established a commemorative plaque in his honour in 1983.