The 16th District of the Iowa Senate is located in central Iowa, and is currently composed of part of Polk and Dallas counties.
The 16th District has been vacant since October 6, 2025, following the death of Senator Claire Celsi. Prior to her death, Celsi had represented the district since 2023. In December 2025, a special election was held. Democrat Renee Hardman won the election.
The area of the 16th District contains two Iowa House of Representatives districts:
The district is also located in Iowa's 3rd congressional district, which is represented by Zach Nunn.
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