The 2011 Zagreb Open (Also known as the Pliva Zagreb Open for sponsorship reasons) was a professional tennis tournament played on outdoor red clay courts. This event was the 16th edition of the tournament and was part of the 2011 ATP Challenger Tour and 2011 ITF Women's Circuit. It took place in Zagreb, Croatia May 9–16, 2011.
| Nationality | Player | Ranking* | Seeding | |
|---|---|---|---|---|
| Ivan Dodig | 45 | 1 | ||
 India | Somdev Devvarman | 70 | 2 | |
| Denis Gremelmayr | 95 | 3 | ||
 Spain | Rubén Ramírez Hidalgo | 97 | 4 | |
 Czech Republic | Jaroslav Pospíšil | 106 | 5 | |
| Björn Phau | 111 | 6 | ||
| Dustin Brown | 119 | 7 | ||
 Slovakia | Lukáš Lacko | 121 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
Guillermo Alcaide
Andrea Arnaboldi
Andrey Kuznetsov| Nationality | Player | Ranking* | Seeding | |
|---|---|---|---|---|
 Turkey | Çağla Büyükakçay | 162 | 1 | |
| Slovakia | Kristína Kučová | 175 | 2 | |
 Ukraine | Yuliya Beygelzimer | 189 | 3 | |
| Slovakia | Lenka Juríková | 196 | 4 | |
| Elitsa Kostova | 197 | 5 | ||
 Romania | Elena Bogdan | 201 | 6 | |
| Spain | Estrella Cabeza Candela | 202 | 7 | |
 France | Nathalie Piquion | 208 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
Tamara Čurović Doroteja Erić Inés Ferrer-Suárez Michaela Hončová
Réka-Luca Jani Katalin Marosi
Barbara SobaszkiewiczSee main article: 2011 Zagreb Open – Men's singles. 
Diego Junqueira def. 
João Souza, 6–3, 6–4
See main article: 2011 Zagreb Open – Women's singles. Nathalie Piquion def. Doroteja Erić, 6–3, 3–6, 6–1
See main article: 2011 Zagreb Open – Men's doubles. Daniel Muñoz de la Nava / Rubén Ramírez Hidalgo def. Mate Pavić / Franko Škugor, 6–2, 7–6(10)
See main article: 2011 Zagreb Open – Women's doubles. Elitsa Kostova / Barbara Sobaszkiewicz def. Ani Mijačika / Ana Vrljić, 1–6, 6–3, [12–10]
