Omer Madison Kem (November 13, 1855 – February 13, 1942) was an American Populist Party politician.

He worked and served as president of the Cottage Grove Electric Company until it was sold to Mountain States Power (now PacifiCorp) in 1922.

While his term in the United States House had been dominated by Populist economic issues, during the second half of his life, Kem increasingly advocated for racial segregation and eugenics.

During his term in the House and afterwards, he took credit for spiritual healing through a spirit guide which he described as an American Indian named "Fleet Wind".

[2]: 85–87 Kem wrote a twelve-volume autobiography, eleven volumes of which are stored at Creighton University in Nebraska.