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Koldihwa is an archaeological site in Uttar Pradesh, India. It is situated in the valleys of Belan River near village Devghat. Along with Mahagara, it is one of the few Neolithic sites in Uttar Pradesh. Both are in district Prayagraj (formerly Allahabad). Also, Koldihwa and Mahagara, both are on the opposite banks of Belan River. Both sites are earliest examples of Rice cultivation Oryza sativa. It is also the site of the finding of horse bones. Location coordinates of Mahagara (and diametrically opposite, Koldihwa) are 24°54'50.0"N 82°03'20.0"E
In Koldihwa, archaeologists found evidences of Rice and some fragmentary bones. In Mahagara, apart from rice, evidence of cattle were found, as hoof marks on clay surface. This is in contrast with other neolithic sites of Indian subcontinent such as Mehrgarh , Chirand and Burzahom, where wheat was found instead of rice, and other sites of southern India, like Hallur and Paiyampalli, where millet was the evidence of grains.