Košarkaški klub Cibona, commonly referred to as Cibona Zagreb or simply Cibona, is a men's professional basketball club based in Zagreb, Croatia. The club is a founding member and shareholder of the Adriatic Basketball Association, and competes in the Croatian League.

Cibona's history dates to late autumn of 1945 when Sloboda (Freedom) was founded as a sports society of bank workers, craftsmen, traders, and clerks. On April 24, 1946, thanks to basketball enthusiast Branimir Volfer and his friends Ljubo Prosen and Joso Miloš, basketball section of Sloboda, the predecessor of today's Cibona, was formed. Its first game was against local rival Slavija on May 7, 1946. Sloboda did not last too long under that name as in November 1946, it merged with Tekstilac, Amater and Grafičar into Sportsko društvo Zagreb (Sports Society Zagreb). Name changing continued through the next four years. In late 1948 it was known as Vihor (Vortex) and already in 1949 as Polet (Elan). Finally, in June 1950, the club changed the name to Lokomotiva (Locomotive) and that name is going to stick for the next 25 years. Lokomotiva competed in Yugoslav top division since 1951, with only two years (1952 and 1960) spent in the second division.

Lokomotiva's first major trophy came in 1969, when they won the Yugoslav Cup, led by legendary Hall of Famer Mirko Novosel. The final game against AŠK Olimpija was played in Lokomotiva's new basketball hall "Kutija šibica" (literally meaning Matchbox). Led by phenomenal trio Većeslav Kavedžija, Nikola Plećaš and Milivoj Omašić, Lokomotiva won the game 78:77.

Their first European trophy came in 1972 when Lokomotiva won the premier edition of FIBA Korać Cup. Their opponent in finals was OKK Beograd and the first game was played in Belgrade. OKK Beograd won the first game 83:71 but in a return match Lokomotiva, led by great Nikola Plećaš (nicknamed Sveti Nikola) who scored 40 points, trashed the Belgrade side by 94–73.

In November 1975, the basketball club split away from the Lokomotiva sports society and came under the direct control of the municipal authorities of the city of Zagreb. Politicians such as Slavko Šajber became very influential in the club during this period and set about getting the club some financial support. In that regard, the club's main sponsors became four SR Croatia-based food industry giants (all of them state-owned at the time): Kraš, Franck, Badel and Voće. The club took the name Cibona, taken from the Latin cibus bonus, which translates to good food.

For the first trophy under the new name Cibona, they had to wait until 1980, when they won the Yugoslav Cup. The Final match was played in Borovo, and Cibona's opponent was mighty Bosna, led by Bogdan Tanjević on the bench, and Mirza Delibašić on the court. But Cibona, led by impressive Andro Knego, managed to beat them 68:62. This trophy marked the beginning of Cibona's golden era, influenced by two great basketball players and Hall of Famers – Krešimir Ćosić and Dražen Petrović. Between 1980 and 1988, Cibona won 14 major trophies: 3 Yugoslav League championships (1982, 1984, 1985), 7 Yugoslav Cups (1980, 1981, 1982, 1983, 1985, 1986, 1988), 2 FIBA European Champions Cups (1985, 1986), and 2 Cup Winners' Cups (1982, 1987).

At the beginning of the war in the Former Yugoslavia in 1991, the team was forced to emigrate in order to play their games, and in an area with the minimum guarantees required by FIBA. For this reason, the club played in Spain for two years (seasons 1991–92 and 1992–93), specifically in Puerto Real (Cádiz).

In independent Croatia, Cibona became a dominant force strongly backed both politically and economically. The crisis of traditionally powerful Dalmatian clubs Split, Zadar and Šibenik also came in hand and Cibona won 11 national titles in a row (from 1992 to 2002). They were also regular Euroleague participant, reaching quarterfinals in 1996/97 and 1999/00.