2019–20 ABA League First Division
The 2019–20 ABA League First Division was the 19th season of the ABA League with 12 teams from Bosnia and Herzegovina, Croatia, Montenegro, Slovenia and Serbia participating in it. The season started on 4 October 2019 and played its last games on 9 March 2020 due to the COVID-19 pandemic.
On 12 March 2020, the ABA League Assembly temporarily suspended its competitions due to the COVID-19 pandemic. On 27 May 2020, the ABA League Assembly canceled definitely its competitions due to the COVID-19 pandemic.
Crvena zvezda mts was the defending champion and as a consequence of the COVID-19 pandemic, the ABA League Assembly decided not to recognize any team as the champion for the season.
Teams
Promotion and relegation
A total of 12 teams will contest the league, including 11 sides from the 2018–19 season and one promoted from the 2018–19 Second Division.;Team promoted from the Second Division
;Team relegated to the Second Division
- Petrol Olimpija
Venues and locations
| Team | Home city | Arena | Capacity |
 Budućnost VOLI | Podgorica | Morača Sports Center | |
 Cedevita Olimpija | Ljubljana | Arena Stožice | |
 Cibona | Zagreb | Dražen Petrović Hall | |
 Crvena zvezda mts | Belgrade | Aleksandar Nikolić Hall | |
| FMP | Belgrade | Železnik Hall | |
 Igokea | Aleksandrovac | Laktaši Sports Hall | |
| Koper Primorska | Koper | Arena Bonifika | |
| Krka | Novo Mesto | Leon Štukelj Hall | |
| Mega Bemax | Belgrade | Ranko Žeravica Sports Hall | |
| Mornar | Bar | Topolica Sport Hall | |
| Partizan NIS | Belgrade | Štark Arena | |
| Zadar | Zadar | Krešimir Ćosić Hall |
Personnel and sponsorship
Coaching changes
Regular season
The regular season starts in September 2019 and ends in March 2020.League table
Positions by round
Results
Statistical leaders
PIR">Performance Index Rating">PIR
Points
Rebounds
Assists
MVP List
MVP of the Round
| Round | Player | Team | Performance Index Rating| |
| 1 |  Lorenzo Brown | Crvena zvezda mts | 30 |
| 2 | Derek Needham | Mornar | 34 |
| 3 | Jaka Blažič | Cedevita Olimpija | 38 |
| 4 | Lance Harris | Koper Primorska | 31 |
| 5 | Rashawn Thomas | Partizan NIS | 31 |
| 6 | Billy Baron | Crvena zvezda mts | 27 |
| 7 |  Jacob Pullen | Mornar | 30 |
| 8 | Filip Bundović | Cibona | 34 |
| 9 | Ivan Novačić | Cibona | 28 |
| 10 | Lorenzo Brown | Crvena zvezda mts | 33 |
| 11 | Lance Harris | Koper Primorska | 37 |
| 12 | Jaka Blažič | Cedevita Olimpija | 48 |
| 13 | Marko Simonović | Mega Bemax | 35 |
| 14 | Domagoj Vuković | Zadar | 39 |
| 15 | Uroš Luković | Mornar | 31 |
| 16 | Justin Cobbs | Budućnost VOLI | 33 |
| 17 | Marko Simonović | Mega Bemax | 32 |
| 18 | Jaka Blažič | Cedevita Olimpija | 32 |
| 19 | Uroš Luković | Mornar | 38 |
| 20 | Justin Cobbs | Budućnost VOLI | 33 |
| 21 | Derek Needham | Mornar | 27 |
Source: