- Civil marriage equality in effect at the state level since 2008. (Same-sex couples may legally marry.)
- Marriage equality recognized by the Mashantucket Pequot Tribal Nation. Tribal law states that, "Two persons may be joined in marriage on the Mashantucket Pequot Reservation," without specifying gender.
- In 2005, Connecticut became the second state in the U.S., following Vermont, to adopt civil unions, and the first to do so without judicial intervention.
- Connecticut was the third state to legalize marriage equality following Massachusetts (2004) and California (2008).
- All existing civil unions were automatically converted to marriages on 1 October 2010.