The 2023 FIBA Basketball World Cup included teams whose rosters consisted of 12 players; a team may opted to have one naturalized player as per FIBA eligibility rules in their roster.
Age and club were as of the start of the tournament, 25 August 2023.
A 23-player roster was announced on 26 May. The final roster was announced on 23 August.
A 30-player roster was announced on 27 July. The final roster was confirmed on 20 August.
A 16-player roster was announced on 19 July. It was reduced to 14 players on 7 August. The final roster was confirmed on 14 August.
A 21-player roster was announced on 6 June. It was reduced to 16 players after the exclusions of Carl Tamayo, Jordan Heading, and Poy Erram due to injuries and the commitment of Utah Jazz guard Jordan Clarkson to play for the country as its naturalized player. The final roster was announced on 23 August.
An 18-player roster was announced on 13 June. On 24 July 2023, the Chinese Basketball Association announced that Minnesota Timberwolves forward Kyle Anderson had become a naturalized Chinese citizen and would play for the country. The final squad was revealed on 22 August.
A 14-player roster was announced on 27 July. The final squad was revealed on 22 August.
A 20-player roster was announced on 24 July. The final roster was announced on 22 August. <section begin=SRB/>
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An 18-player roster was announced on 10 August. The final squad was revealed on 25 August.
A 22-player roster was announced on 20 July. On 13 August, it was reduced to 14 players. The final roster was announced on 19 August. Dinos Mitoglou suffered an injury shortly before the tournament and had to withdraw. Because the replacement deadline had passed, Mitoglou could not be replaced.
A 17-player roster was announced on 16 August. The roster was finalized on 20 August.
A 14-player roster was announced on 29 June . The final squad was revealed on 24 August.
<section begin=USA />The roster was announced on 6 July.
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A 20-player roster was announced on 1 August. The final squad was revealed on 22 August.
A 33-player roster was announced on 12 July. It was reduced to 15 on 25 July. The final 12-player roster was unveiled on 15 August.
A 24-player roster was announced on 13 July. It was reduced to 14 players on 31 July. The final roster was announced on 22 August.
A 24-player roster was announced on 12 June. It was reduced to 17 players on 21 July. The final squad was revealed on 16 August.
An 18-player roster was announced on 8 May. It was reduced to 15 players on 6 August. It was reduced again to 13 players on 9 August. The final squad was revealed on 23 August.
A 22-player roster was announced on 19 July. The final group was revealed on 18 August.
An 18-player roster was announced on 12 June. It was reduced to 14 players on 7 August, and the final roster was announced on 10 August.
A 25-player roster was announced on 19 June. The final roster was revealed on 21 August.
A 15-player roster was announced on 4 August. The final roster was announced on 23 August.
A 18-player roster was announced on 12 July. The final roster was unveiled on 16 August.
A 20-player roster was announced on 3 July. The final roster was unveiled on 14 August.
A 21-player roster was announced on 18 July. The final roster was announced on 24 August.
A 25-player roster was announced on 21 June. The group was reduced to 14 players on 2 August. The final roster was announced on 21 August. Raul Neto suffered an injury during the first game and was ruled out for the remainder of the tournament.
A 27-player roster was announced on 9 June. It was reduced to 15 on 31 July. The final roster was announced on 21 August.
A 31-player roster was announced on 15 June. The group was reduced to 13 players on 12 August, and was finalized on 20 August.
A 16-player roster was announced on 5 July. Ricky Rubio withdrew due to mental health problems on 5 August 2023. The final roster was announced on 19 August.
An 18-player roster was announced on 13 July. The group was reduced to 14 players on 7 August. The final roster was announced on 24 August.
The roster was announced on 28 June. Frank Ntilikina withdrew due to an injury and was replaced by Isaia Cordinier.
A 24-player roster was announced on 28 June. It was reduced to 14 players on 16 August. The final roster was announced on 22 August.
A 16-player roster was announced on 21 July. The final roster was announced on 23 August.
League systems with 13 or more players represented are listed.
<sup> a </sup> As the Euroleague is a multinational league and all competing teams compete in their domestic leagues, the total percentage will be over 100 because of duplications.<br><sup> b </sup> Includes players from the NBA, NBA G League, Canadian Elite Basketball League, US NCAA, and US High School teams.
Clubs with 5 or more players represented are listed.