The lieutenant governor of Connecticut is the second highest executive officer of the government of the U.S. State of Connecticut. The lieutenant governor acts as President of the State Senate, presiding over the Senate and casting votes in the event of a tie. They are elected to serve four-year terms and run on the same ticket as the governor as running mate with no term limits. They are the first in the gubernatorial line of succession of Connecticut and serve as acting governor in the absence of the governor and as governor for the remainder of the term in the event the governor dies, resigns, or is removed from office. The incumbent lieutenant governor is Democrat Susan Bysiewicz since 2019, after winning the 2018 gubernatorial election and winning reelection in the 2022 gubernatorial election. Her second and current term is set to expire on January 6, 2027. The following is a list of lieutenant governors of the State of Connecticut:

Lieutenant governors of the State of Connecticut, 1776–present