Hardeol is one of the major peaks in the Garhwal Himalaya. It stands for `temple of God` and is the highest peak on the northern side of the ring of peaks surrounding the Nanda Devi Sanctuary, which lies in the northeast corner of the rings. Hardeol is situated in the northern end of the Milam valley, which is in the Pithoragarh district of Uttarakhand. Hardeol Peak is located at an altitude of 7161 metres above mean sea level in India.

In the north of Hardeol lies Trishuli and in its south is Rishi Pahar on a north south trending ridge, which leads to Nanda Devi East. Hardeol is also known as Trishuli South.