Zvonimir Ivišić (born 9 August 2003), nicknamed "Big Z",[1] is a Croatian college basketball player for the Arkansas Razorbacks[2] of the Southeastern Conference (SEC).

[7] Ivišić made his collegiate debut on January 20, 2024, against Georgia and had 13 points, five rebounds, two assists, three blocks and two steals in 16 minutes played during a 105–96 win.

[11] Ivišić was named to the Croatia national under-16 basketball team and played in the 2019 FIBA U16 European Championship.

[12] He also played for Croatia in the 2023 FIBA U20 European Championship and averaged 11.4 points, 5.3 rebounds, and 3.4 blocks per game.

[13] Zvonimir's twin brother Tomislav Ivišić was also a professional basketball player with whom he moved to Šibenik in Croatia from his hometown Vitez in Bosnia and Herzegovina when he was 14 to play for Šibenka.