Donji Dobretin is located in the municipality Dvor, in Sisak-Moslavina County at an elevation of 131 meters above sea level and it covers the area of 4.37 km² (1.69 sq. miles). According to the 2011 census report, there were 19 inhabitants. It is entirely populated by Serbs. Nearby places: Gornji Dobretin, Stanić Polje, Javornik, Zut, Kotarani, Javnica, Matijevići, Sočanica, Zakopa and Dvor.