| Prevseason: | 2016–17 |
| Nextseason: | 2018–19 |
| Season: | 2017–18 |
| Champions: | Cedevita (5th title) |
| Runners Up: | Cibona |
| Semifinalists: | Split Zadar |
| Promoted: | Bosco Gorica |
| Relegated: | Zagreb Ribola Kaštela Jazine Arbanasi |
| Teams: | 13 |
| Duration: | October 6, 2017–April 26, 2018 (Regular season) May 2, 2018 - June 3, 2018 (Playoffs) |
| Tv: | HRT Arena Sport |
| Top Seed: | Cedevita |
| Top Scorer: | Steven Gray (Zadar) |
| Ppg: | 19.8 |
| Ppg N: | USA |
| Rebounds Leader: | Luka Žorić (Cibona) |
| Rpg: | 8.1 |
| Rpg N: | HRV |
| Assists Leader: | Mirza Sarajlija (Jazine Arbanasi) |
| Apg: | 6.0 |
| Apg N: | SVN |
The 2017–18 HT Premijer liga was the 27th season of the HT Premijer liga, the highest professional basketball league in Croatia. It started on 6 October 2017 and finished on 3 June 2018.
Cedevita retained the title and achieved their fifth league overall.
As in the previous season, all participants in A-1 League including teams that play ABA League joined the regular season. It was played with a double round-robin format where the eight first qualified teams joined the playoffs while the last qualified one was relegated.
After the resign of Jolly Šibenik to its berth, the league was reduced to 13 teams. Jazine and Ribola Kaštela were promoted from the previous season. They would replace Gorica and Kvarner 2010.
| Team | Coach | City | Venue | Capacity | |
|---|---|---|---|---|---|
| Alkar | Srđan Helbich | Sinj | ŠD Sinj | ||
| Cedevita | Zagreb | Dom Sportova | |||
| Cibona | Ante Nazor | Zagreb | Dražen Petrović Basketball Hall | ||
| Hermes Analitica | Zvonimir Mravak | Zagreb | ŠD Prirodoslovne škole Vladimir Prelog | ||
| Jazine Arbanasi | Luka Bujas | Zadar | Jazine Basketball Hall | ||
| Ribola Kaštela | Ivica Ćelan | Kaštel Sućurac | Sportska dvorana Sokolana | ||
| Split | Split | Arena Gripe | |||
| Šibenik | Vladimir Anzulović | Šibenik | Sportska dvorana Baldekin | ||
| Škrljevo | Damir Rajković | Škrljevo | Dvorana Mavrinci | ||
| Vrijednosnice | Osijek | Gradski Vrt | |||
| Zabok | Ivan Perinčić | Zabok | Zabok Sports Hall | ||
| Zadar | Aramis Naglić | Zadar | Dvorana Krešimir Ćosić | ||
| Zagreb | Nikola Garma | Zagreb | ŠD Trnsko |
| Teams that play in the 2017–18 First Adriatic League | ||
| Teams that play in the 2017–18 Second Adriatic League | ||
| Teams that play in the 2017-18 Alpe Adria Cup |
Quarterfinals and semifinals were played in a best-of-three-games format, while the finals in a best-of-five one (1-3-5).
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