| Prevseason: | 2008–09 |
| Nextseason: | 2010–11 |
| Season: | 2009–10 |
| Champions: | Krka Novo Mesto 3rd title |
| Runners Up: | Union Olimpija |
| Semifinalists: | Helios Domžale Šentjur |
| Tv: | RTV Slovenija |
| Teams: | 12 + 1 |
| Duration: | 3 October 2009 – 9 June 2010 |
| Top Seed: | Union Olimpija |
| Mvp: |  Shawn King |
| Finals Mvp: | Smiljan Pavič |
| Ppg: | 20.7 |
| Rpg: | 11.3 |
| Apg: | 5.4 |
The 2009–10 Slovenian Basketball League (official: 2009–10 Telemach League) was the 19th season of the Premier A Slovenian Basketball League, the highest professional basketball league in Slovenia. Krka Novo Mesto won its 3rd national championship.
| Team | City | Arena | Capacity | Head coach |
|---|---|---|---|---|
| Elektra | Šoštanj | Šoštanj Sport Hall | 600 | Borut Cerar |
| Geoplin Slovan | Ljubljana | Kodeljevo Sports Hall | 1,540 | Miro Alilović |
| Helios | Domžale | Komunalni center Hall | 2,500 | Rado Trifunović |
| Hopsi Polzela | Polzela | Polzela Sport Hall | 1,800 | Boštjan Kuhar |
| Krka | Novo Mesto | Leon Štukelj Hall | 2,800 | Aleksandar Džikić |
| Luka Koper | Koper | Arena Bonifika | 4,000 | Aleksander Sekulić |
| LTHcast Mercator | Škofja Loka | Poden Hall | 500 | Dalibor Damjanović |
| Union Olimpija | Ljubljana | Tivoli Hall | 4,050 | Jure Zdovc |
| Parklji | Ljubljana | ŠRC Ježica | 300 | Đorđe Đokić |
| PRO-TEK Zasavje | Trbovlje | Polaj Sports Hall | 1.500 | Igor Pučko |
| Šenčur CP Kranj | Šenčur | Šenčur Sports Hall | 800 | Martin Gorenec |
| Šentjur | Šentjur | Hruševec Sports Hall | 800 | Damjan Novaković |
| Zlatorog Laško | Laško | Tri Lilije Hall | 2,500 | Aleš Pipan |
| Teams from the Adriatic League |
| Pos | Team | P | W | L | F | A | Pts |
| 1 | Krka | 22 | 16 | 8 | 1748 | 1547 | 38 |
| 2 | Helios Domžale | 22 | 16 | 8 | 1684 | 1540 | 38 |
| 3 | PRO-TEK Zasavje | 22 | 15 | 7 | 1784 | 1695 | 37 |
| 4 | Parklji Ljubljana | 22 | 13 | 9 | 1695 | 1628 | 35 |
| 5 | Geoplin Slovan | 22 | 13 | 9 | 1720 | 1662 | 35 |
| 6 | Zlatorog Laško | 22 | 13 | 9 | 1761 | 1741 | 35 |
| 7 | Šentjur | 22 | 12 | 10 | 1711 | 1750 | 34 |
| 8 | Hopsi Polzela | 22 | 12 | 10 | 1708 | 1656 | 34 |
| 9 | LTHcast Mercator | 22 | 10 | 12 | 1542 | 1549 | 32 |
| 10 | Elektra Šoštanj | 22 | 8 | 14 | 1658 | 1719 | 30 |
| 11 | Luka Koper | 22 | 4 | 18 | 1660 | 1804 | 26 |
| 12 | Šenčur CP Kranj | 22 | 0 | 22 | 1459 | 1839 | 22 |
P=Matches played, W=Matches won, L=Matches lost, F=Points for, A=Points against, Pts=Points
| Pos | Team | P | W | L | F | A | Pts |
| 1 | Union Olimpija | 14 | 12 | 2 | 1164 | 982 | 26 |
| 2 | Krka | 14 | 11 | 3 | 1169 | 959 | 25 |
| 3 | Helios Domžale | 14 | 11 | 3 | 1059 | 930 | 24 |
| 4 | Šentjur | 14 | 7 | 7 | 1076 | 1098 | 21 |
| 5 | Parklji Ljubljana | 14 | 5 | 9 | 1009 | 1167 | 19 |
| 6 | PRO-TEK Zasavje | 14 | 4 | 10 | 996 | 1114 | 18 |
| 7 | Zlatorog Laško | 14 | 3 | 11 | 1013 | 1099 | 17 |
| 8 | Geoplin Slovan | 14 | 3 | 11 | 1038 | 1122 | 17 |
| Qualified for the Playoff stage | ||
| Withdrew from competition |
| Pos | Team | P | W | L | F | A | Pts |
| 1 | Hopsi Polzela | 8 | 7 | 1 | 691 | 576 | 15 |
| 2 | Elektra Šoštanj | 8 | 7 | 1 | 634 | 555 | 15 |
| 3 | Luka Koper | 8 | 4 | 4 | 626 | 597 | 12 |
| 4 | LTHcast Mercator | 8 | 2 | 6 | 526 | 637 | 10 |
| 5 | Šenčur CP Kranj | 8 | 0 | 8 | 608 | 720 | 8 |
| bgcolor=F6CECE | Qualified for Relegation Playoffs | |
| bgcolor=F5A9A9 | Relegated to Second Division | |
| width=50% valign=top | Performance Index Rating |
| width=50% valign=top |
|}|}
| width=50% valign=top | Rebounds |
|}|}