Mlechino (Bulgarian: Млечино) is a village in Ardino Municipality, Kardzhali Province, southern-central Bulgaria.

Local lore claims the water, which flows from the roots of birch trees, can treat kidney ailments.

Northward, about 8 kilometers between Gorno and Dolno Prahovo, a mosque complex is located.

Approximately 9 kilometers north of Mlechino, near Bashevo, stands the Krivus Fortress.

This bridge, built in the early 16th century, has not been altered for over 500 years and features a distinctive hexagon engraving on its arch.