The 2015 ICC Cricket World Cup was the 11th Cricket World Cup, a quadrennial One Day International (ODI) cricket tournament contested by men's national teams and organised by the International Cricket Council (ICC). It was jointly hosted by Australia and New Zealand from 14 February to 29 March 2015, and was won by Australia, defeating New Zealand by 7 wickets in the final. This was the second time the tournament was held in Australia and New Zealand, the first having been the 1992 Cricket World Cup. India were the defending champions having won the previous edition in 2011, but they were eliminated by eventual champions Australia in the semi-finals.

The tournament consisted of 14 teams, which were split into two pools of seven, with each team playing every other team in their pool once. The top four teams from each pool progressed to the knockout stage, which consisted of quarter-finals, semi-finals and a final.

The final was between the co-hosts Australia and New Zealand. Australia won by seven wickets, to win their fifth Cricket World Cup.

The total attendance was 1,016,420, with an average of 21,175 per game. The final at the Melbourne Cricket Ground had a crowd of 93,013, a record one-day cricket crowd for Australia In India, the largest television rating was for the Australia–India semi-final, 15% of television-viewing households.

The ICC announced the hosts for the previous World Cup, the 2011 competition, on 30 April 2006. Australia and New Zealand had also bid for the tournament and a successful Australian bid for the 2011 World Cup would have seen a 50–50 split in games, with the final still up for negotiation. The Trans-Tasman bid, Beyond Boundaries, was the only bid for 2011 delivered to the ICC headquarters at Dubai before 1 March deadline. Considerable merits of the bid included the superior venues and infrastructure, and the total support of the Australian and New Zealand governments on tax and custom issues during the tournament, according to Cricket Australia chief executive James Sutherland. The New Zealand government had also assured that the Zimbabwean team would be allowed to take part in the tournament after political discussions about whether their team would be allowed to tour Zimbabwe in 2005.

ICC President Ehsan Mani said that the extra time required by the Asian bloc to hand over its bid had harmed the four-nation bid. However, when it came to the voting, the Asians won by seven votes to four; according to the Pakistan Cricket Board (PCB), it was the vote of the West Indies Cricket Board (WICB) that turned the matter. It was reported in Pakistani newspaper Dawn that the Asian countries promised to hold fundraising events for West Indian cricket during the 2007 Cricket World Cup, which may have influenced the vote. However, I.S. Bindra, chairman of the monitoring committee of the Asian bid, denied that, saying that it was their promise of extra profits of US$400 million that swung the vote their way.

The ICC was so impressed by the efficiency of the Trans-Tasman bid that they decided to award the next World Cup, to be held in 2015, to them.

Australia and New Zealand last jointly hosted the Cricket World Cup in 1992.