The Jasper County Courthouse is located in Newton, Iowa, United States, and was built from 1909 to 1911.

[2] Court was first held in Jasper County in 1846 in a one-room addition to the log cabin of Matthew D.

The simplified version of the Beaux Arts style was designed by the prominent Des Moines architectural firm of Proudfoot & Bird.

American general and Iowa politician James B. Weaver wrote of the current courthouse in the 1912 county history, "long after the pages of this county history are worn and turned yellow with age, in all human probability this building will stand in all its massive beauty".

The interior has ceramic tile and marble, and freestanding column screens divide the hallways from the rotunda.