The 1906 Iowa State Senate elections took place as part of the biennial 1906 United States elections. Iowa voters elected state senators in 22 of the state senate's 50 districts. State senators serve four-year terms in the Iowa State Senate. A statewide map of the 50 state Senate districts in the 1906 elections is provided by the Iowa General Assembly here. The 1906 elections were the last in Iowa before primary elections were established by the Primary Election Law in 1907. The general election took place on November 6, 1906.