2020 Delaware Senate election

The 2020 Delaware Senate election was held on November 3, 2020, concurrently with the elections for the Delaware House of Representatives, to elect members to the Delaware General Assembly. 11 of the 21 seats in the Delaware Senate were up for election. Primary elections were held on September 16, 2020.

Democrats increased their majority in the Senate by gaining two seats, winning 14 seats, compared to seven seats for the Republicans.

Democrats

 * 1) District 1: Harris McDowell III retired.

In primary elections

 * 1) District 13: Democrat David McBride lost renomination to Marie Pinkney, who went on to win the general election.

In the general election

 * 1) District 5: Republican Catherine Cloutier was defeated by Democrat Kyle Evans Gay.
 * 2) District 7: Republican Anthony Delcollo was defeated by Democrat Spiros Mantzavinos.

District
Results of the 2020 Delaware State Senate election by district:

Closest races
Seats where the margin of victory was under 10%:
 * 1) District 7, 2.8% gain
 * 2) District 5, 4.6% gain