The 2010 United States Senate election in Connecticut was a midterm election which took place on November 2, 2010 to decide a Class III Senator from the State of Connecticut to join the 112th United States Congress. Incumbent Democratic U.S. Senator Chris Dodd suffered from dropping approval ratings in the past few years due to major controversies, leading him to announce in January 2010 that he would retire, instead of seeking a sixth term. As Dodd was a Democrat, Richard Blumenthal, incumbent State Attorney General, announced on the same day that he would run for Dodd's seat. The Connecticut Democratic Party nominated Blumenthal on May 21. Businesswoman Linda McMahon won the state party's nominating convention and the August 10 Republican primary to become the Republican candidate. This was the first open Senate seat in Connecticut since 1980 where Dodd was first elected. Blumenthal was the only non-incumbent Democrat to win a non-special election in 2010.

Richard Blumenthal is an American lawyer and politician who is the senior United States senator from Connecticut, a seat he has held since 2011. A member of the Democratic Party, he is one of the wealthiest members of the Senate, with a net worth over $100 million. He was Attorney General of Connecticut from 1991 to 2011.