Interstate Highways in the U.S. state of Connecticut run a total of 446.33 miles (718.30 km).

[1] In 1957, Connecticut received approval for the routes of its three primary Interstate highways: I-84, I-91, and I-95.

The first Interstate Highway signs were installed on a completed section of I-91 north of Hartford in 1961.

The primary interstates were all completed by 1969 after the last section of I-84 opened between Farmington and Plainville.

The rest of the highways were built or renumbered to their current designations by 1994 when a five-mile section of I-291 opened 35 years behind schedule.