A special election was held on March 2, 2021, to fill Connecticut's 27th State Senate district after incumbent Democrat Carlo Leone resigned on January 5, 2021.

The election was won by Democrat Patricia Billie Miller.

[1] A special election was held on April 13, 2021, to fill Connecticut's 112th House of Representatives district after incumbent Republican J.P. Sredzinski resigned on February 17, 2021.

[1] A special election was held on April 27, 2021, to fill Connecticut's 145th House of Representatives district after incumbent Democrat Patricia Miller resigned on March 8, 2021, after winning a special election to the Connecticut State Senate.

[1] A special election was held on August 17, 2021, to fill Connecticut's 36th State Senate district after incumbent Democrat Alexandra Kasser resigned on June 22, 2021.