Mannankadu (also, Mannangadu, Tamil: மன்னங்காடு) is a village in the Pattukkottai taluk of Thanjavur district, Tamil Nadu, India. It is one of the 36 villages falls under the Nadu in the district. Mannangadu is one of the revenue village in its taluk. It is located on state highway Adirampattinam-Mannargudi-Kumbakonam, between Adirampattinam and Madukkur. It is the fourth largest village in Pattukkottai taluk, after Thamarankottai, Thambikottai and Aalathur. Total geographical area of the Village is 740.20 hectares.