A total of 107 films vied for awards in six competitive categories, as well as the audience award, Mehr News Agency wrote.
The film was awarded for its special filming which was done by Mohammad Haddadi.
The nine-day festival featured 238 films representing 57 countries, workshops, panels, debates, master classes, exhibitions and a series of live acts under the DokuNights with world stars such as Omar Souleyman and Yasmine Hamdan performing.
A documentary film of rare delicacy, 'Starless Dreams' explores the interior world of young imprisoned women in Iran with an indelible emotional precision and sensitivity to its subject.
Director of 'Iraq Year Zero', Abbas Fahdel who won the Best Film Award, said that he is interested in Iran's cinema.
US filmmaker James Longley also said the flick was very influential and humanitarian.
He added, "I like to make a film in Iran and also cooperate with Oskouei."
DokuFest, International Documentary and Short Film Festival, is the largest film festival in Kosovo. Each year the festival fills the cinemas and improvised screening venues around historic city center of Prizren with a selection of more than 200 handpicked films from around the world.
The festival is known for its lively atmosphere, the amazing enthusiasm that grasps the city and its people and also for more than 150 volunteers working for the festival. Documentary photo exhibitions, debates, master classes and lively music events were also part of the nine days festival.
The 15th DokuFest took place from August 5-13 in Prizren, Kosovo.