Charles Valdo Bardeen Sr. (September 23, 1850 – March 20, 1903) was an American lawyer and judge in the U.S. state of Wisconsin.

He worked with Adams on a business venture in Colorado Springs, but returned to Wisconsin after about two years.

Bardeen ran for the new 16th circuit judgeship in the Spring 1891 election prevailed with about 61% of the vote.

[3] He served six years as circuit judge, and then, in January 1898, he was appointed to the Wisconsin Supreme Court by Governor Edward Scofield.

The following April, Bardeen was elected without opposition to finish out the remainder of Newman's judicial term, expiring at the end of 1903.