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.

The following players received wildcards into the singles main draw: The following players received entry from the qualifying draw: The following players received wildcards into the singles main draw: The following players received entry from the qualifying draw: Diego Junqueira def.

Doroteja Erić, 6–3, 3–6, 6–1 Daniel Muñoz de la Nava / Rubén Ramírez Hidalgo def.

Mate Pavić / Franko Škugor, 6–2, 7–6(10) Elitsa Kostova / Barbara Sobaszkiewicz def.