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Basketball's club history has two centres of gravity. One is the NBA, launched in 1946 and a magnet for the world's best talent ever since; the other is the European continental club competition that began in 1958 — today's EuroLeague — and the powerhouse clubs that grew up around it. The two worlds differ in court dimensions, season structure and player development, but the question that measures a club's stature is the same: how much did it win, how long did it keep winning, and across how many eras.

The twelve clubs below were chosen on that basis: ten from the NBA and two from Europe — Real Madrid, the EuroLeague's most decorated club, and Panathinaikos, which reclaimed a seventh title in Berlin in 2024. CSKA Moscow, with eight EuroLeague titles the second-most in Europe, is excluded here because it has been barred from European competition since 2022, as is six-time champion Maccabi Tel Aviv, which sits in the same tier.

All four metrics are drawn from top-tier competition titles: total championships won, the longest championship streak, the number of separate decades in which a title was won, and the span from a club's first title to its most recent. Laid side by side, these four expose the shape of a dynasty — the Chicago Bulls, who crammed six titles into seven years, and the Golden State Warriors, who spread theirs across 75 years, were not great in the same way. Figures run through the 2024-25 season for the NBA and the 2024-25 EuroLeague season for European clubs.