Christopher Andrew Coons (born September 9, 1963) is an American lawyer and politician serving as the senior United States senator from Delaware, a seat he has held since 2010. A member of the Democratic Party, Coons served as the county executive of New Castle County from 2005 to 2010.

Raised in Hockessin, Delaware, Coons graduated from Amherst College in Massachusetts, where he joined the Delta Kappa Epsilon fraternity. He received graduate degrees from Yale Divinity School and Yale Law School. He went to work as a volunteer relief worker in Kenya, where he had taken classes at the University of Nairobi, later returning to the U.S. to work for the Coalition for the Homeless in New York. He spent some time as a legal clerk in New York before returning to Delaware in 1996, where he spent eight years as in-house counsel for a materials manufacturing company. In the interim he worked for several nonprofit organizations.

Coons served as president of the New Castle County Council from 2001 to 2005 and county executive of New Castle County from 2005 to 2010. He balanced the county budget with a surplus in fiscal year 2010 by cutting spending and raising taxes, and the county maintained a AAA bond rating. Coons contested the 2010 Senate special election for Delaware. He defeated the Republican nominee, Christine O'Donnell, to succeed Ted Kaufman, who had been appointed to the seat when Joe Biden resigned to become Vice President of the United States. He was elected to a full term in 2014. Coons is the vice chair of the Senate Ethics Committee, having chaired the committee from 2021 to 2025. His other committee assignments include Appropriations, Foreign Relations, Judiciary, and Small Business and Entrepreneurship. He previously served as ranking member of the Senate Foreign Relations Subcommittee on African Affairs and the Judiciary Subcommittee on Bankruptcy and the Courts.

Coons co-chaired the 2017 and 2019 National Prayer Breakfasts and co-chairs the weekly Senate Prayer Breakfast. The New York Times called him an "effective" emissary of Joe Biden to former and current Republican lawmakers in Biden's 2020 campaign for president.

Coons became Delaware's senior senator and the dean of Delaware's congressional delegation when Tom Carper retired from the Senate in January 2025.

Coons was born in Greenwich, Connecticut, the son of Sarah Louise "Sally" (née Ives) and Kenelm Winslow "Ken" Coons. His ancestry includes English and Irish. Coons grew up in Hockessin, Delaware, where he attended the public Yorklyn Elementary School and later H.B. DuPont Middle School. His parents struggled financially and divorced in the mid-1970s. He and his two brothers lived with their mother for a few years until 1977, when his mother married Robert W. Gore, the President of W. L. Gore and Associates.

He graduated from the private Tower Hill School and then Amherst College in 1985 with a Bachelor of Arts in chemistry and political science. While in college, he was a member of Delta Kappa Epsilon fraternity (Sigma chapter) and a U.S. Senate intern. In 1983, Coons was awarded a Truman Scholarship. During his junior year of college, he studied abroad at the University of Nairobi in Kenya through St. Lawrence University's Kenya Semester Program. In 1992, he earned a master's degree in ethics from Yale Divinity School and a J.D. degree from Yale Law School. In 2018, Delaware State University named Coons as an Honorary Doctor in Humane Letters.

After college, Coons worked in Washington, D.C., for the Investor Responsibility Research Center, where he wrote a book on South Africa and the U.S. divestment movement. He then worked as a volunteer for the South African Council of Churches and as a relief worker in Kenya, before returning to the U.S. to work for the National Coalition for the Homeless in New York. In 1992, he earned a J.D. degree from Yale Law School, and a master's degree in ethics from Yale Divinity School.