2023–24 ABA League Second Division

The 2023–24 ABA League Second Division is the 6th season of the ABA Second Division with 14 teams from Bosnia and Herzegovina, Croatia, Montenegro, North Macedonia, Serbia, and Slovenia participating in it.

Clubs
A total of 14 clubs contest the league for the 2023–24 season, based on the results in the domestic championships and taking into consideration the results in the previous season.

Distribution
The following is the access list for this season. This season, instead of wild card invitation, qualification rounds determine one participant.

Club allocation
The labels in the parentheses show how each team qualified for the place of its starting round:
 * 1st–5th: Positions in national leagues at the end of regular season or playoffs.
 * ABA1: Relegated from the First Division.

Qualifying rounds
4 teams competed in two preliminary rounds. Teams were paired in two-legged matches, with winners decided on aggregate score.

First preliminary round
Games were played from September 21 to and September 26. Winners advanced to the second preliminary round.


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Second preliminary round
Games were played on October 1 and October 4. Winner advanced to the regular season stage.


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Regular season
The Regular season is split in five tournaments featuring two or three rounds.

Playoffs
Based on the results and position of the clubs in the standings after the regular season, Playoffs will take place with teams from 1st to 8th position. The Quarterfinals will be played in knockout pairs 1–8, 2–7, 3–6, 4–5. The winners of the Quarterfinals will qualify to the Semifinals and the winners of the Semifinals will play the Final.

Bracket
Knock-out elimination phases will be played under two-game format. Better placed team plays second leg at home court. 