Tievebaun () is a mountain located on the border of County Leitrim and County Sligo, Ireland. Its classifications include Arderin and Vandeleur-Lynam. Its height is . The mountain is notable for its cliffs as well as the pinnacles on the eastern and northern sides, such as Eagle's Rock and The Hag's Leap.
Tievebaun is the third-highest mountain in the Dartry Mountains, and ranks as the 254th highest mountain in Ireland. It is the highest independent peak in County Leitrim; however, the mountain's summit is only the second-highest point in the county, as the southeast ridge of Truskmore Mountain lies within Leitrim, at .