The 2018 Connecticut Senate election was held on November 6, 2018, concurrently with the elections for the Connecticut House of Representatives, to elect members to the Connecticut General Assembly. All 36 seats in the Connecticut Senate were up for election. The election resulted in Democrats expanding control in both chambers of the Connecticut General Assembly, ending the split control in the Senate, that had been in place since the 2016 elections. Primary elections were held on August 14, 2018.