Hartford is the capital city of the U.S. state of Connecticut. It was the seat of Hartford County until Connecticut disbanded county government in 1960. It is the core city in the Greater Hartford metropolitan area. Census estimates since the 2010 United States census have indicated that Hartford is the fourth-largest city in Connecticut with a 2020 population of 121,054, behind the coastal cities of Bridgeport, New Haven, and Stamford.

Hartford was founded in 1635 and is among the oldest cities in the United States. It is home to the country's oldest public art museum (Wadsworth Atheneum), the oldest publicly funded park (Bushnell Park), the oldest continuously published newspaper (the Hartford Courant), and the second-oldest secondary school (Hartford Public High School). It is also home to the Mark Twain House, where the author wrote his most famous works and raised his family, among other historically significant sites. Mark Twain wrote in 1868, "Of all the beautiful towns it has been my fortune to see this is the chief."

Hartford has been the sole capital of Connecticut since 1875. Before then, New Haven and Hartford alternated as dual capitals, as part of the agreement by which the Colony of New Haven was absorbed into the Colony of Connecticut in 1664.

Hartford was the richest city in the United States for several decades following the American Civil War. Since 2015, it has been one of the poorest cities in the country, with three out of ten families living below the poverty threshold. In sharp contrast, the Greater Hartford metropolitan statistical area was ranked 32nd of 318 metropolitan areas in total economic production and 8th out of 280 metropolitan statistical areas in per capita income in 2015.

Nicknamed the "Insurance Capital of the World", the city holds high sufficiency as a global city, as home to the headquarters of many insurance companies, the region's major industry. Other prominent industries include the services, education and healthcare industries. Hartford coordinates certain Hartford-Springfield regional development matters through the Knowledge Corridor Economic Partnership.