Jacob Dietrich (August 22, 1857 – February 6, 1932) was an American businessman and politician.
From 1882 to 1887, Dietrich lived in Bismarck, Dakota Territory where he was in the general store business.
He then returned to Cedarburg, Wisconsin and was in the banking and real estate business.
Dietrich served on the Ozaukee County Board of Supervisors and was a Democrat.
This article about a Democratic Party member of the Wisconsin State Assembly is a stub.