The 2000–01 Euroleague was the inaugural basketball season of the EuroLeague, under the newly formed Euroleague Basketball Company's authority, and it was the 44th season of the premier competition for European men's professional basketball clubs overall. It started on October 16, 2000, with a regular season game between hosts Real Madrid Teka and Olympiacos, which was held at the Raimundo Saporta Pavilion, in Madrid, Spain,^[1] and it ended with the last championship finals game on May 10, 2001, which was held at the PalaMalaguti arena, in Bologna, Italy.

This season did not feature all of the top-tier level European club basketball teams, as some of them opted to compete in the 2000–01 FIBA SuproLeague competition instead, after the row erupted between the previous EuroLeague governing body, FIBA, and the newly established Euroleague Basketball Company.

A total of 24 teams competed for the EuroLeague title, which was in the end won by Kinder Bologna. Dejan Tomašević was the EuroLeague Regular season MVP, and Manu Ginóbili was the EuroLeague Finals MVP.

The EuroLeague (or historically called, the FIBA European Champions' Cup) was originally established by FIBA, and it operated under its umbrella from 1958, until the summer of 2000, concluding with the 1999–2000 season. That was when Euroleague Basketball Company was created.

Because FIBA had never trademarked the "EuroLeague" name, and Euroleague Basketball simply used it without any legal ramifications, because FIBA had no legal recourse to prevent it, so they had to find a new name for their league. Thus, the following 2000–01 season started with 2 separate top European professional club basketball competitions: the FIBA SuproLeague (previously known as the FIBA EuroLeague) and the brand new 2000–01 Euroleague season.

The rift in European professional club basketball initially showed no signs of letting up. Top clubs were also split between the two leagues: Panathinaikos, Maccabi Elite Tel Aviv, CSKA Moscow, and Efes Pilsen stayed with FIBA, while Olympiacos, Kinder Bologna, Real Madrid, FC Barcelona, Tau Cerámica, and Benetton Treviso joined Euroleague Basketball.

A total of 24 teams from 14 countries participate in the competition.

The table below shows the default access list.

The competition culminated in a best 3 out of 5 playoff series.

The labels in the parentheses show how each team qualified for the place of its starting round

The first phase was a regular season, in which the competing teams were drawn into four groups, each containing six teams. Each team played every other team in its group at home and away, resulting in 10 games for each team in the first stage. The top 4 teams in each group advanced to the next round, The Top 16. The complete list of tiebreakers is provided in the lead-in to the Regular Season results.

If one or more clubs were level on won-lost record, tiebreakers were applied in the following order:

In a best-of-three series the remaining 16 teams were placed against each other. The games were held between the 31st of January and the 14th of February, 2001, with the top 8 teams advancing to the Playoffs.

In a best-of-three series the remaining eight teams were placed against each other. The games were held between 21 February and 7 March 2001, with the top 4 teams advancing to the semifinals.

In a best-of-five series the remaining four teams were placed against each other. The games were held between the 27th of March and the 7th of April, 2001.

The culminating stage of the Euroleague season, the two remaining teams that won the semifinal series played each other in a best-of-five series.

In May 2001, Europe had two continental champions, Maccabi Tel Aviv of the FIBA SuproLeague and Kinder Bologna of Euroleague Basketball Company's EuroLeague. The leaders of both organizations realized the need to come up with a new single competition. Negotiating from the position of strength, Euroleague Basketball Company dictated proceedings, and FIBA essentially had no choice but to agree to their terms. As a result, the EuroLeague was fully integrated under Euroleague Basketball Company's umbrella, and teams that competed in the FIBA SuproLeague during the 2000-01 season joined it as well. It is today officially admitted that European basketball had two champions that year, Maccabi of the FIBA SuproLeague and Kinder Bologna of the Euroleague Basketball Company's EuroLeague.

A year later, Euroleague Basketball Company and FIBA decided that Euroleague Basketball's EuroLeague competition would be the main basketball tournament on the continent, to be played between the top level teams of Europe. FIBA Europe would also organize a European league for third-tier level teams, known as the FIBA Europe League competition, while Euroleague Basketball would also organize its own second-tier level league, combining FIBA's long-time Korać Cup and Saporta Cup competitions into one new competition, the EuroCup. In 2005, Euroleague Basketball and FIBA decided to cooperate with each other, and did so jointly until 2016.

In essence, the authority in European professional basketball was divided over club-country lines. FIBA stayed in charge of national team competitions (like the FIBA EuroBasket, the FIBA World Cup, and the Summer Olympics), while Euroleague Basketball took over the European professional club competitions. From that point on, FIBA's Korać Cup and Saporta Cup competitions lasted only one more season before folding, which was when Euroleague Basketball launched the EuroCup.