The 2020 Connecticut State Senate election took place on November 3, 2020. Part of the biennial 2020 United States elections. Connecticut voters elected senators in all of the 36 State Senate districts. State senators serve two-year terms in the Connecticut State Senate, with all 36 of the seats up for election each cycle. The Primary Elections on August 11, 2020, determined which candidates appeared on the ballot for the general election. Four primary elections were cancelled, including three Republican primary elections. As a result, four Incumbent candidates ran uncontested.