Ilarion Ridge is a partly ice-free ridge of elevation 240 m situated in Breznik Heights on Greenwich Island, Antarctica. Extending along the south coast of Hardy Cove, 2 km southwest of Parchevich Ridge, 1.9 km east-northeast of Lyutitsa Nunatak, 2.5 km northeast of Vratsa Peak, 1.3 km north of St. Kiprian Peak, and 2.6 km north-northwest of Fort Point. Overlooking Musala Glacier to the south.