The ICS Ioroball Cup is the premier Ioroball tournament in the sport. It has been held every two years since 15 AKR, with a number of exceptions, such as the 19 ICS Ioroball Cup, which was cancelled because of the Catastrophe of the Star. The location of the Cup changes every time with the ICS Cup Commission picking the location four years prior to the event. Crelina, as the origin of the sport, has held the Cup the most times with 479.
Apart from the first few cups, qualification tournaments occurred prior to each cup, generally in the even years. 1144 planets attempted qualification for the 2751 ICS Ioroball Cup. The maximum was the 2719 ICS Ioroball Cup, for which 1568 planets attempted qualification. The amount of teams which will attempt qualification for 2753 is currently believed to be 1301.
The 15 ICS Ioroball Cup was a single four-team round-robin, without any other matches, the placements being decided by the end-ranking of the round-robin. 17 employed an identical round-robin, but with playoffs between the first and second teams (final) and the third and fourth teams (bronze final) according to the rankings at the end of the round-robin.