| Louis Frederick Dietrich | |
| Birth Date: | 13 September 1868 |
| Birth Place: | Wilmot, Ontario, Canada |
| Death Place: | Kitchener, Ontario, Canada |
| Office: | Mayor of Waterloo, Ontario |
| Term Start: | 1929 |
| Term End: | 1930 |
| Predecessor: | William D. Brill |
| Successor: | William Uffelman |
| Occupation: | Politician, Businessman |
Louis Frederick Dietrich (September 13, 1868 - June 11, 1947) was an automobile dealer and politician in Ontario, Canada. He served as mayor of Waterloo from 1929 to 1930.
Dietrich was born to German-Canadian parents Gregor Dietrich (1842—1906) and Emelia Doll (1843—1913) in St. Agatha. Around 1888, he apprenticed as a blacksmith in Baden and set up shop in his hometown in 1892. In 1893, he became a dealer for John Deere farm implements. In 1909, he moved to Waterloo and, two years later, he became a dealer for International Harvester. In 1915, he became a dealer for the Ford Motor Company. The following year, Dietrich became a Dodge franchisee.
He served on Waterloo council from 1922 to 1928. During his term as mayor, the Kitchener-Waterloo Municipal Airport was opened.[1]
He died in 1947 in Kitchener, in Waterloo Region.