Mullach Glas (, meaning grey/green peak) at , is the 197th-highest peak in Ireland on the Arderin scale, and the 238th-highest peak on the Vandeleur-Lynam scale. Mullach Glas is located on a small massif that includes Binn Mhór (), and Corcogemore (); this massif is at the far southeastern sector of the long north-west to south-east cental spine of the Maumturks mountain range in the Connemara National Park in Galway, Ireland. Mullach Glas is the 5th-highest mountain in the Maumturks range.