Theodore Dieckmann (November 6, 1853 – October 6, 1919) was an American businessman and Democratic politician.
Dieckmann owned a jewelry business in Sheboygan, Wisconsin.
He served on the Sheboygan Common Council and was mayor of the city.
In 1893, Dieckmann served in the Wisconsin State Assembly and was a Democrat.
This article about a Republican Party member of the Wisconsin State Assembly born in the 1850s is a stub.