R. Dov Lior, Rosh Yeshiva and Rav of Kiryat Arba as well as head of Va'ad Rabbanei Yesha, was asked by a college student whether he is allowed to study evolution. R. Lior responds that he does not accept the theory of evolution but does not consider it objectionable:
We can accept the view that there was evolution, on condition that we remember that the world has a Creator. How it exactly happened are details that do not matter much, once we have established the principle that there is a Creator of the world.
אנחנו יכולים לקבל את ההנחה שהיתה אבולוציה, בתנאי שנזכור שיש בורא לעולם. איך זה קרה בדיוק, אלו פרטים שלא כל-כך משנים, אחרי שקבענו את היסוד שיש בורא לעולם.link (hat tip to Tsvi)
On the subject of evolution, see R. Slifkin's article in The Jerusalem Post, The Problem with Intelligent Design.