Herman C. Quirmbach, Ph.D. (born October 6, 1950) is the Iowa State Senator from the 23rd District. A Democrat, he has served in the Iowa Senate since 2003 and served on the Ames City Council from 1995 to 2003. He received his B.A. from Harvard College and his M.A. and Ph.D. from Princeton University, the Ph.D. in 1983, and is an associate professor of economics at Iowa State University. 
Quirmbach currently serves on several committees in the Iowa Senate - the Education committee; the Human Resources committee; the Judiciary committee; and the Ways and Means committee; and the Local Government committee, where he is chair. He also serves as vice chair of the Education Appropriations Subcommittee.
Quirmbach was re-elected in 2006 with 11,782 votes (57%), defeating Republican opponent Linda Livingston. 
Quirmbach and Roger Y. Tsien, an American biochemist and Nobel Laureate, were roommates during their freshman year.