Runni Saidpur is a town and a block located in Sitamarhi district, Bihar, India. It is situated on the southern bank of the Lakhandei River. National Highway 22, the main national highway connecting Sonbarsa-Muzaffarpur-Hajipur-Patna-Gaya-Chandwa, National Highway 22 passes through Runni Saidpur. Thus it is a gateway to Sitamarhi and parts of Nepal. This town is basically a block headquarters. Even though it is managed by gram panchayats, it is far more developed than many small towns run by nagar panchayat. This is far bigger than Belsand which is a nearby sub-division. Runni is the name of another village which is a mile south of it. The name of the block is combinedly Runni Saidpur. In the early days this area had a large number of mango orchards.
