List of special elections to the United States Senate

Special elections to the United States Senate are held to fill the vacancies that occur when a senator dies or resigns before the completion of their six-year term. Winners of these special elections typically serve the remainder of the term of the senator who has caused the vacancy. General elections to the U.S. Congress are held in November of even-numbered years. New Congresses convened on March 4 of the following year until 1934, and since then, new Congresses have begun on January 3 of the following year.

Because of the cost of conducting a special election,^[1] most states hold elections to fill a Senate vacancy in conjunction with the next general election, while some states, such as Alabama^[2] and Texas, allow for special elections to the Senate to be held before a general election (similar to special elections to the U.S. House of Representatives, though special elections are on a state-wide basis). Special elections can alter the balance of power in the Senate,^[3] as can temporary appointments.