Grønhøi is a mountain in Lesja Municipality in Innlandet county, Norway. The 1650 m tall mountain lies within Reinheimen National Park, about 20 km southwest of the village of Lesjaskog. The mountain is surrounded by several other mountains including Digervarden which is about 5.5 km to the northeast, Skarvehøi which is about 9 km to the north-northwest, Holhøi which is 8 km to the northwest, Løyfthøene and Gråhø which are about 8 km to the west, and Buakollen which is about 2.5 km to the southwest.