[1] Iran Jordan Lebanon Qatar India Kazakhstan Iraq Syria Australia China Philippines South Korea New Zealand Japan Chinese Taipei Hong Kong Palestine Macau Guam Fiji Bahrain Saudi Arabia United Arab Emirates Oman Sri Lanka Bangladesh Maldives Bhutan Nepal Indonesia Thailand Singapore Malaysia Brunei Cambodia Sub-Zone Pre-Qualifiers took place during the same second and third windows of 2019 FIBA Basketball World Cup Qualifiers.

Teams from the Persian Gulf region played in two different rounds, during the same second and third windows of FIBA Basketball World Cup 2019 Qualifiers.

Results from both rounds were aggregated in order to qualify top two teams to the Western Region Pre-Qualifiers.

South Asia Basketball Association (SABA) started their pre-qualifiers on 26 June 2018 in Bangladesh, during the third window of the Asian qualifiers.

The round-robin format tournament featured six teams participating from which the top four advanced to the Eastern Region Pre-Qualifiers.

The Pre-Qualifiers (Eastern Region) was held in Nonthaburi, Thailand from 26 November to 1 December 2018, during the fifth window of 2019 World Cup qualification.

[9] Iran Jordan Lebanon Qatar India Kazakhstan Iraq Syria Australia China Philippines South Korea New Zealand Japan Chinese Taipei Hong Kong Saudi Arabia Palestine Bahrain Sri Lanka Guam Malaysia Thailand Indonesia The draw for the main qualifiers was held on 8 June 2019 in Bangalore, India.

Due to the COVID-19 pandemic, the FIBA Executive Committee decided in September 2020, that the games played in the November 2020 and February 2021 windows would be held at a single venue under a bubble format.

[15] Indonesia was confirmed as hosts of the 2021 FIBA Asia Cup on 18 December 2020, therefore qualifying for the tournament proper regardless of their final placing.