Boston Celtics. The Boston Celtics franchise has the most championship titles in the NBA, with 17 banners; rival Los Angeles Lakers come in second with 16, which is at least 10 more than any other team. So, what to expect at a Celtics game from today's squad? An all-around fun experience, a charged atmosphere and devotion, from the fans to the team and the team to the fans. You'll hear "Let's Go, Cel-tics" no matter the score. Season runs from late October to April, and playoffs last until mid-June. TD Garden, 100 Legends Way, West End, Boston, Massachusetts, 02114. 866/423–5849;