| Date: | June 29 - July 5 |
| Edition: | 3rd |
| Location: | Rijeka, Croatia |
| Champs: |  Paolo Lorenzi |
| Champd: |  Sebastián Decoud /  Miguel Ángel López Jaén |
The 2009 Rijeka Open was a professional tennis tournament played on outdoor red clay courts. It was the 3rd edition of the tournament which was part of the 2009 ATP Challenger Tour. It took place in Rijeka, Croatia between 29 June and 5 July 2009.
That was the last tournament for Mathieu Montcourt who died on 6 July 2009 in Boulogne-Billancourt. He played very well in Rijeka, reaching the semifinals where he lost to Blaž Kavčič. A police source said on 9 July 2009 after a preliminary autopsy that Mathieu suffered a cardiac arrest.
| Nationality | Player | Ranking* | Seeding | |
|---|---|---|---|---|
| Spain | Iván Navarro | 68 | 1 | |
 France | Mathieu Montcourt | 104 | 2 | |
| Roko Karanušić | 110 | 3 | ||
| Spain | Rubén Ramírez Hidalgo | 115 | 4 | |
 Australia | Peter Luczak | 158 | 5 | |
| Spain | Daniel Muñoz de la Nava | 167 | 6 | |
| Argentina | Sebastián Decoud | 169 | 7 | |
| Stéphane Bohli | 180 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
Pavol Červenák
Nikola Ćirić Simone VagnozziSee main article: 2009 Rijeka Open – Singles. Paolo Lorenzi def. Blaž Kavčič, 6–3, 7–6(2)
See main article: 2009 Rijeka Open – Doubles. Sebastián Decoud / Miguel Ángel López Jaén def. Ivan Dodig / Antonio Veić, 7–6(7), 3–6, [10–8]