Košarkaški klub Crvena zvezda (Serbian Cyrillic: Кошаркашки клуб Црвена звезда, transl. Red Star Basketball Club), usually referred to as KK Crvena zvezda or simply Crvena zvezda, currently named Crvena zvezda Meridianbet for sponsorship reasons, is a men's professional basketball club based in Belgrade, Serbia, and the major part of the Red Star multi-sports club. The club is a founding member and shareholder of the Adriatic Basketball Association, and it competes in the Serbian League (KLS), the ABA League, and the continental top-tier EuroLeague.

Crvena zvezda is regarded as one of the most successful clubs in Serbia history; their squads have won 24 National League championships, including 10-in-a-row and 9-in-a-row sequences. They have played in three different National Leagues since 1945, including the Yugoslav First Federal League (1945–1992), the First League of Serbia and Montenegro (1992–2006) and the Serbian League (2006 onwards). They have also won 14 National Cup titles, 7 Adriatic League Championships, one Adriatic Supercup, and one FIBA Saporta Cup. The club plays home matches in the Belgrade Arena. Zvezda's supporters are known as Delije.

The Zvezda's rise to dominance began in their inaugural season by winning the 1946 Yugoslav Championship. FIBA Hall of Fame player-coach Nebojša Popović and Aleksandar Gec, along with a talented supporting cast of future Hall of Famers Aleksandar Nikolić and Borislav Stanković, would lead Crvena zvezda into the greatest period in club history, winning ten consecutive Yugoslav championships in as many seasons throughout the 1940s and early 1950s. After the retirement of Popović in 1956, Zvezda entered a period of rebuilding. Led by forward Vladimir Cvetković and future FIBA Hall of Fame point guard Zoran Slavnić, Zvezda returned to championship caliber, winning two Yugoslav championships in 1969 and 1972. Crvena zvezda won the only European-wide competition in club history, the FIBA European Cup Winner's Cup in 1974. The club struggled throughout the 1980s with a talented cast led by point guard Zoran Radović and FIBA Hall of Fame coach Ranko Žeravica.

Zvezda again returned to dominance in the 1990s following the breakup of Yugoslavia and joining the league with Serbian and Montenegrin clubs. Led by guard Saša Obradović, Crvena zvezda won the 1993 and 1994 championships. The club also won one more title in 1998. After winning 15 championships throughout the 20th century, Zvezda, now competing in the Adriatic and the Serbian League, after struggling through the 2000s, rose again to dominance in the late 2010s. The Crvena zvezda squads won nine consecutive Serbian championships (2015–2024) and seven Adriatic championships in the same nine-year span.

Zvezda has a notable rivalry with Partizan. The rivalry started immediately after the creation of the two clubs in 1945 and the two clubs have been dominant in domestic basketball since then. The Partizan legends and future Hall of Fame players Dražen Dalipagić and Vlade Divac had their stints with Zvezda in the 1990s.

Crvena zvezda is the only club in the world to have produced two members now in the Hall of Fame (Stanković and Nikolić) and four in the FIBA Hall of Fame (Stanković, Popović, Radomir Šaper, and Nikolić). The four of them have the highest Order of Merit from FIBA.

The club was founded on 4 March 1945, as a basketball section of the Crvena zvezda Sports Society. By winning the first of ten consecutive championship titles after the Second World War, the golden age of Crvena zvezda began. No domestic national selection could be imagined without seven or eight Zvezda's players and the first five featured Nebojša Popović, Tullio Rochlitzer, Aleksandar Gec, Ladislav Demšar, and Srđan Kalember. They first played in an open-air court at the Kalemegdan fortress.

That long-awaited eleventh title was won in the 1968–69 season, when Crvena zvezda won all six games against Jugoplastika, Zadar and Partizan, therefore proving to be better than all three fierce rivals. Led by Vladimir Cvetković, the title was won by Dragan Kapičić, Zoran Lazarević, Ivan Sarjanović, Ljubodrag Simonović, Srđan Škulić, Zoran Slavnić, Tihomir Pavlović, Nemanja Đurić, Miroslav Todosijević, Dragiša Vučinić and Dubravko Kapetanović. At that time, they were the youngest championship-winning team in Yugoslavian basketball. The twelfth title was won in the 1971–72 season. In the 1970s the club won the Yugoslav Cup three times, and most of the work in those years was done by Slavnić, Simonović, Kapičić, Vučinić, and Živković. This generation of players won two national championships and three national cups.