Moel Eilio is a mountain in Snowdonia, in the county of Gwynedd, Wales. It presents two subsidiary peaks, Foel Goch and Foel Gron. It is 726 m (2382 feet) high and is classified as a Marilyn. Significant accumulations of snowfall take place on the summit during the winter season, due to its relatively flat, grassy slopes. It offers great views of a wide group of mountains in the northwestern side of the Snowdonia National Park. The most popular ascent is from Llanberis and climbs by way of Bwlch y Groes and then the north ridge of the summit.