Theodore B. Werner (June 2, 1892 – January 24, 1989) was a U.S. Democratic politician who served as a member of Congress from South Dakota.

[1] He attended parochial schools in Iowa, after which he studied law in Illinois and Wisconsin.

In 1909 Werner moved to Rapid City, South Dakota, where he became involved in the newspaper and commercial printing businesses.

In 1932 Werner was elected to the United States House of Representatives.

In 1947 Werner was appointed United States Marshal for South Dakota, and he served until 1951.