Louis Orville Breithaupt served as the 18th Lieutenant Governor of Ontario, Canada, from 1952 to 1957.

Breithaupt became head of his family’s leather business, Breithaupt Leather Company, in Kitchener. He was a Kitchener alderman for four years, and in 1923 became the youngest mayor in the city’s history. He was a Liberal Member of Parliament from 1940 to 1952.

Breithaupt was appointed Lieutenant Governor of Ontario in 1952 and served until 1957. In 1953, he was awarded an honorary LL.D from McMaster University.

Breithaupt was active in many service organizations, such as the YMCA and Rotary Club. In 1959, he became Chancellor of Victoria University. Breithaupt died in Toronto in 1960 at the age of 70.