The Iowa State Capitol, commonly called the Iowa Statehouse, is in Iowa's capital city, Des Moines. As the seat of the Iowa General Assembly, the building houses the Iowa Senate, Iowa House of Representatives, the Office of the Governor, and the Offices of the Attorney General, Auditor, Treasurer, and Secretary of State. The building also includes a chamber for the Iowa Supreme Court, although court activities usually take place in the neighboring Iowa Supreme Court building. The building was constructed between 1871 and 1886, and is the only five-domed capitol in the country.

The Iowa Senate is the upper house of the Iowa General Assembly, United States. There are 50 seats in the Iowa Senate, representing 50 single-member districts across the state of Iowa with populations of approximately 60,927 per constituency, as of the 2010 United States census. Each Senate district is composed of two House districts. The Senate meets at the Iowa State Capitol in Des Moines.