Sareni is a village and corresponding community development block in Lalganj tehsil of Rae Bareli district, Uttar Pradesh, India. Historically the seat of a pargana, it is located 18 km from Lalganj, the tehsil headquarters, on the road to Daundia Khera in Unnao district. As of 2011, Sareni has a population of 4,819 people, in 792 households. It has 3 primary schools and no healthcare facilities. It serves as the headquarters of a nyaya panchayat which also includes 10 other villages.