J. C. U. Niedermann (born 1810) was an America brickmaker who served one year as a National Union Party member of the Wisconsin State Assembly from the 5th Milwaukee County assembly district (the 5th Ward of the city of Milwaukee, Wisconsin) in 1864, succeeding Democrat Peter V. Deuster. He also served as a constable, and on the Milwaukee Common Council and the Milwaukee County board of supervisors at various times in the late 1850s and early 1860s.