| Slovenia Open | |
| Logo Size: | 100px |
| Founded: | 2005 |
| Abolished: | 2022 |
| Editions: | 7 |
| City: | Portorož |
| Country: | Slovenia |
| Tier: | Tier IV (2005–2008) WTA International (2009–2010) WTA 250 (2021–present) |
| Surface: | Hard / outdoor |
| Draw: | 32M / 24Q / 16D |
| Prize Money: | $235,238 |
| Completed Event: | 2022 |
| Women's Singles: |  Kateřina Siniaková |
| Women's Doubles: |  Marta Kostyuk Tereza Martincová |
| Website: | Slovenia Open |
The Slovenia Open was a women's tennis tournament held in Portorož, Slovenia, originally from 2005 until 2010, and returned to the tour in 2021 and 2022. The WTA Tour event was a WTA International category, and then transitioned to its most recent variant, the WTA 250 category. It was played on outdoor hardcourts.
Katarina Srebotnik finished runner-up in the singles finals of 2005 and 2007, and in the doubles final in 2005.
| Year | Champions | Runners-up | Score | |
|---|---|---|---|---|
| Katarina Srebotnik | 6–2, 4–6, 6–3 | |||
| 7–5, 6–1 | ||||
| 2–6, 6–4, 6–4 | ||||
| 6–3, 6–3 | ||||
| 6–7(5–7), 6–1, 7–5 | ||||
 Johanna Larsson | 6–1, 6–2 | |||
| Not held | ||||
| 7–6(7–4), 6–2 | ||||
| 6–7(4–7), 7–6(7–5), 6–4 | ||||
| Year | Champions | Runners-up | Score | |
|---|---|---|---|---|
| Jelena Kostanić Katarina Srebotnik | 6–4, 5–7, 6–2 | |||
| w/o | ||||
| Lucie Hradecká (2) Renata Voráčová (2) | Andreja Klepač  Elena Likhovtseva | 5–7, 6–4, [10–7] | ||
| Vera Dushevina Ekaterina Makarova | 6–4, 6–1 | |||
| 6–4, 6–2 | ||||
| Maria Kondratieva Vladimíra Uhlířová (2) | 6–4, 2–6, [10–7] | |||
| Not held | ||||
| 4–6, 6–2, [12–10] | ||||
| 6–4, 6–0 | ||||