The Boston Celtics lead all franchises with 18 recorded titles. Each franchise's count includes the titles it won under earlier city names. Counts below include only championships present in the archive — nothing is estimated.
Titles by franchise
- Boston Celtics — 18 titles
- Los Angeles Lakers — 17 titles (incl. Minneapolis Lakers)
- Golden State Warriors — 7 titles (incl. Philadelphia Warriors)
- Chicago Bulls — 6 titles
- San Antonio Spurs — 5 titles
- Detroit Pistons — 3 titles
- Miami Heat — 3 titles
- New York Knicks — 3 titles
- Philadelphia 76ers — 3 titles (incl. Syracuse Nationals)
- Houston Rockets — 2 titles
- Milwaukee Bucks — 2 titles
- Oklahoma City Thunder — 2 titles (incl. Seattle SuperSonics)
- Atlanta Hawks — 1 title (incl. St. Louis Hawks)
- Baltimore Bullets — 1 title
- Cleveland Cavaliers — 1 title
- Dallas Mavericks — 1 title
- Denver Nuggets — 1 title
- Portland Trail Blazers — 1 title
- Sacramento Kings — 1 title (incl. Rochester Royals)
- Toronto Raptors — 1 title
- Washington Wizards — 1 title (incl. Washington Bullets)
Data: seasons/index.json champions (official postseason game logs), grouped by franchise team id — every fact above derives from this portal's committed archive; nothing is estimated.