Kostinbrod Pass (Bulgarian: Костинбродски проход, ‘Kostinbrodski Prohod’ \'ko-stin-brod-ski 'pro-hod\) is the ice-covered saddle of elevation 1417 m[1] separating Doyran Heights from Flowers Hills in Sentinel Range, Ellsworth Mountains in Antarctica. It is part of the glacial divide between Valoga Glacier and Sikera Valley.
The pass is named after the town of Kostinbrod in Western Bulgaria.
Kostinbrod Pass is centred at -78.4331°N -84.4719°W, which is 6.16 km northeast of Mount Havener, 9.53 km south of Dickey Peak and 7.32 km west-northwest of Gubesh Peak. US mapping in 1961, updated in 1988.