Hariharnath Mahadev Mandir () is a Hindu temple dedicated to Shiva in Bihar, India. It is located in Hariharpur village, Kumahara Vishanpur panchayat, Dumra block of Sitamarhi district. It was associated with the Ramayana. During the festival of Shravan Sombari, devotees flock to the temple to perform Jalabhisheka.

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