The Boston Celtics also known as the "Celts" are a National Basketball Association (NBA) team based in Boston, Massachusetts. They play in the Atlantic Division of the Eastern Conference. Founded in 1946, the team is currently owned by Boston Basketball Partners LLC. The Celtics play their home games at the TD Garden, which they share with the Boston Bruins of the NHL. The Celtics' 17 NBA Championships are the most for any NBA franchise, with their Western Conference rival, the Los Angeles Lakers, following with 16 NBA Titles. From 1957 to 1969, the Celtics dominated the league winning 11 championships in 13 years, and eight in a row (1959–1966), the longest consecutive streak of any North American pro sports team.

The Celtics dominated the league during the late 1950s and through the mid 1980s, with the help of many Hall of Famers which include Bill Russell, Bob Cousy, John Havlicek, Larry Bird and legendary Celtics coach Red Auerbach, combined for a 795–397 record that helped the Celtics win 16 Championships. Before the retirement of the “Big Three”, who included Larry Bird, Robert Parish and Kevin McHale, thanks to some creative maneuvering by Auerbach, the Celtics had drafted second overall pick Len Bias but the team fell into decline as the college star died two days after he was drafted. Later, the team suffered another tragedy when their star player Reggie Lewis died of a heart attack in his prime.

Boston (pronounced /ˈbɒstən/ or locally /ˈbɔstən/ ( listen)) is the capital of and largest city in Massachusetts, and is one of the oldest cities in the United States. The largest city in New England, Boston is regarded as the unofficial "Capital of New England" for its economic and cultural impact on the entire New England region. The city proper, covering only 48.43 square miles, had a population of 617,594 according to the 2010 U.S. Census. Boston is also the anchor of a substantially larger metropolitan area called Greater Boston, home to 4.5 million people and the tenth-largest metropolitan area in the country. Greater Boston as a commuting region is home to 7.6 million people, making it the fifth-largest Combined Statistical Area in the United States.

In 1630, Puritan colonists from England founded the city on the Shawmut Peninsula. During the late 18th century, Boston was the location of several major events during the American Revolution, including the Boston Massacre and the Boston Tea Party. Several early battles of the American Revolution, such as the Battle of Bunker Hill and the Siege of Boston, occurred within the city and surrounding areas. Through land reclamation and municipal annexation, Boston has expanded beyond the peninsula. After American independence was attained Boston became a major shipping port and manufacturing center, and its rich history now helps attract many tourists, with Faneuil Hall alone attracting over 20 million every year. The city was the site of several firsts, including America's first public school, Boston Latin School (1635), and the first subway system in the United States (1897).